= Cryptochrome
A <cryptochrome> is a member of a light-sensitive <protein> family involved in biological timing and development. In <plants>, blue-light <perception> by <cryptochromes> contributes to responses including growth regulation and entrainment of the <circadian clock>.
A <light> input that resets the <circadian clock> can change the timing of a later response even after illumination ends. This distinguishes a clock-mediated effect from a response that simply follows the current <light> level; <photoperiodism> can depend on both.
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