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Noun
A
hormone
,
related
to
serotonin
,
that
is
secreted
by
the
pineal gland
,
and
stimulates
colour
change
in
the
skin
of
reptiles
,
and
is
involved
in
the
sleep
/
wake
and
reproductive
cycles
in
mammals
.
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Rejected by Y-Combinator. Definitions by Wiktionary.

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