ECB-ART-40406
Science
1966 Jul 08;1533732:197-8. doi: 10.1126/science.153.3732.197.
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Compound ocellus of a starfish: its function.
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The relative effect of light in inducing downward movements of the tips of isolated arms of Asterias amurensis is maximal at 485 millimicrons when the compound ocellus is intact; at 504 millimicrons when the ocellus has been removed. This finding suggests the coexistence of two photoreceptive systems, ocellar and nonocellar.
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