| http://www.w3.org/ns/prov#value | - These genes produce receptors for neuropeptides, chemical messengers that modulate behaviors, such as anxiety, over an extended period, and it may be, she said, that variations in certain behaviors develop as these neuropeptide circuits respond in different ways to environmental stimuli over time. (Survival behaviors such as fighting or fleeing, by contrast, are regulated by neurotransmitters, whi
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