STRANGE NEWS!  My computer has managed to understand English
not completely (yet) but began to understand word phrases and clauses.
Here is its proof!


Sentence=17205-------------------------------------------------------------->
. During prolonged illumination the cGMP-gated channels close, thus reducing the influx of Ca2+.
preprocessing==================+++++++++++++++++++++>
Ca2+<<<-----fix br="" unknown="" word="">.S During ||adv. manner
S prolonged ||a.
S illumination ||n.
Noun Phrase ------------------> 1 3    prolonged illumination
S the ||+def. art.
S cGMP-gated ||a.
S channels ||n.||pl.
Noun Phrase ------------------> 3 6    the cGMP-gated channels
S close ||+reg. v.||v. t.||imp. & p. p. Closed||p. pr. & vb. n. Closing||v. i.
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvverb------> close
,S thus ||adv. manner
;;;;;   punctuation---> ,S
S reducing ||+reg. v.||v. t.||imp. & p. p. Reduced||p. pr. & vb. n. Reducing
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvverb------> reducing
S the ||+def. art.
S influx ||n.
S of ||prep.
S Ca2+ ||n.
Noun Phrase ------------------> 9 13    the influx of Ca2+



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postprocessing==================+++++++++++++++++>
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. During||adv. manner 
 prolonged illumination ----->Noun Phrase
 the cGMP-gated channels ----->Noun Phrase
 close||+reg. v.||v. t.||imp. & p. p. Closed||p. pr. & vb. n. Closing||v. i. 
, thus||adv. manner  {{comma0-0
 reducing||+reg. v.||v. t.||imp. & p. p. Reduced||p. pr. & vb. n. Reducing  {{comma0-1
 the influx of Ca2+ ----->Noun Phrase {{comma0-5
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#word=12

Sentence=17204-------------------------------------------------------------->
). The Ca2+ that enters is extruded by a specialized Ca2+ carrier in the outer segment membrane, and this process maintains a
constant Ca2+ concentration in the outer segment.
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). The Ca2+ ----->Noun Phrase
 that||+conj. {{that0-0
 enters||+reg. v.||v. t.||imp. & p. p. Entered||p. pr. & vb. n. Entering||v. i.||present t. {{that0-1
 is||+reg. v.||v. i. {{that0-2
 extruded||v. t.||imp. & p. p. Extruded||p. pr. & vb. n. Extruding {{that0-3
 by||+prep. {{that0-4
 a specialized Ca2+ carrier ----->Noun Phrase {{that0-8
 in||+prep. {{that0-9
 the outer segment membrane ----->Noun Phrase {{that0-13
, and||+conj. {{and1-0 {{comma0-0
 this process ----->Noun Phrase {{and1-2{{comma0-2
 maintains||+reg. v.||v. t.||imp. & p. p. Maintained||p. pr. & vb. n. Maintaining||present t. {{and1-3 {{comma0-3
 a constant Ca2+ concentration ----->Noun Phrase {{and1-7{{comma0-7
 in||+prep. {{and1-8 {{comma0-8
 the outer segment ----->Noun Phrase {{and1-11{{comma0-11
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#word=27



Sentence=17206-------------------------------------------------------------->
. This reduction
in influx leads to a slow decrease in the intracellular Ca2+ concentration because the extrusion of Ca2+ continues.
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. This reduction ----->Noun Phrase
 in||+prep. 
 influx ----->Noun Phrase
 leads||+irreg. v. neutral||v. t.||imp. & p. p. Leaded||p. pr. & vb. n. Leading||imp. & p. p. Led||v. i.||present t. 
 to||+prep. 
 a slow decrease ----->Noun Phrase
 in||+prep. 
 the intracellular Ca2+ concentration ----->Noun Phrase
 because||+conj. {{because0-0
 the extrusion of Ca2+ ----->Noun Phrase {{because0-4
 continues||+reg. v.||v. i.||imp. & p. p. Continued||p. pr. & vb. n. Continuing||v. t.||present t. {{because0-5
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#word=19


Sentence=17207-------------------------------------------------------------->
The slow decrease in Ca2+ concentration allows the cone membrane potential to recover from its initial hyperpolarizing response to bright illumination because
Ca2+ inhibits guanylyl cyclase, the enzyme that synthesizes cGMP from GTP.
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. The slow decrease ----->Noun Phrase
 in||+prep. 
 Ca2+ concentration ----->Noun Phrase
 allows||+reg. v.||v. t.||imp. & p. p. Allowed||p. pr. & vb. n. Allowing||v. i.||present t. 
 the cone membrane potential ----->Noun Phrase
 to||to-inf. 
 recover ----->Noun Phrase
 from||+prep. 
 its||+poss. det. 
 initial hyperpolarizing response ----->Noun Phrase
 to||+prep. 
 bright illumination ----->Noun Phrase
 because||+conj. {{because0-0
 Ca2+ ----->Noun Phrase {{because0-1
 inhibits||v. t.||imp. & p. p. Inhibited||p. pr. & vb. n. Inhibiting||present t. {{because0-2
 guanylyl cyclase ----->Noun Phrase {{because0-4
, the enzyme ----->Noun Phrase {{because0-6{{comma0-1
 that||+conj. {{that1-0 {{comma0-2
 synthesizes||v. t.||present t. {{that1-1 {{comma0-3
 cGMP ----->Noun Phrase {{that1-2{{comma0-4
 from||+prep. {{that1-3 {{comma0-5
 GTP||pn. {{that1-4 {{comma0-6
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#word=32


Sentence=17208-------------------------------------------------------------->
. Thus, in darkness, when the Ca2+ level is relatively high, guanylyl cyclase is
maintained in a partially inhibited state.
preprocessing==================+++++++++++++++++++++++++++++++++>
Ca2+<<<-----fix br="" unknown="" word="">guanylyl<<<-----fix br="" unknown="" word="">cyclase<<<-----fix br="" unknown="" word="">.S Thus ||adv. manner
,S in ||+prep.
;;;;;   punctuation---> ,S
S darkness ||n.
Preposition Phrase ------------------> 2 3   IN darkness
,S when ||+conj.
;;;;;   punctuation---> ,S
===========================subordinating conjunction------> when
..................................................................................adverb clause------> when
S the ||+def. art.
S Ca2+ ||n.
S level ||n.
Noun Phrase ------------------> 4 7    the Ca2+ level
S is ||+reg. v.||v. i.
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvverb------> is
S relatively ||adv.
S high ||a.
,S guanylyl ||n.
zzzzzzzzzzzzz
;;;;;   punctuation---> ,S
S cyclase ||n.
Noun Phrase ------------------> 10 12    guanylyl cyclase
S is ||+reg. v.||v. i.
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvverb------> is
SRN maintained ||+reg. v.||v. t.||imp. & p. p. Maintained||p. pr. & vb. n. Maintaining
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvverb------> maintained
S in ||+prep.
S a ||+indef. art.
Preposition Phrase ------------------> 15 16   IN a
S partially ||adv. manner
S inhibited ||a.
S state ||n.
Noun Phrase ------------------> 17 19    inhibited state
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postprocessing==================+++++++++++++++++++++>
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. Thus||adv. manner 
, in||+prep.  {{comma0-0
 darkness ----->Noun Phrase {{comma0-1
, when||+conj. {{when0-0 {{comma1-0
 the Ca2+ level ----->Noun Phrase {{when0-3{{comma1-3
 is||+reg. v.||v. i. {{when0-4 {{comma1-4
 relatively||adv. {{when0-5 {{comma1-5
 high||a. {{when0-6 {{comma1-6
, guanylyl cyclase ----->Noun Phrase {{when0-8{{comma2-1
 is||+reg. v.||v. i. {{when0-9 {{comma2-2
 maintained||+reg. v.||v. t.||imp. & p. p. Maintained||p. pr. & vb. n. Maintaining {{when0-10 {{comma2-3
 in||+prep. {{when0-11 {{comma2-4
 a ----->Noun Phrase {{when0-12{{comma2-5
 partially||adv. manner {{when0-13 {{comma2-6
 inhibited state ----->Noun Phrase {{when0-15{{comma2-8
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