What type of rock is shown in the picture? 
Definitions:
Suprachiasmatic Nucleus
A tiny region in the brain's hypothalamus responsible for controlling circadian rhythms.
Retinal Proteins
Proteins located in the retina that play a crucial role in the conversion of light into visual signals.
Light-Sensitive
Having a sensitivity to light; often refers to materials or organisms that react to light in some significant way.
Pineal Gland
A small, pea-shaped gland in the brain that produces and regulates some hormones, including melatonin, which affects the sleep cycle.
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