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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
opsin
1.
opsin
(substance)
retinal protein formed by the action of light on rhodopsin
Broader (hypernym)
protein
Substance meronym
iodopsin
,
retinal purple
,
rhodopsin
,
visual purple
Based on WordNet 3.0 copyright © Princeton University.
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. English edition:
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