Assertion: gametogenesis | /r/Desires | short day-lengths
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Source sentences:
text: Gametogenic timing also can be switched in the sea urchin Strongylocentrotus purpuratus but the mechanism of the photoperiodic response is fundamentally different; gametogenesis requires short day-lengths; continues indefinitely under a repeated short day, fall-winter photoperiod regime, and apparently does not involve an endogenous calendar.