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Noun
Any
of
a
class
of
heterocyclic
compounds
containing
pyrrole
rings
arranged
in
a
square
or
other
similar
shape
;
they
are
important
in
biochemistry
in
a
form
with
a
metal
atom
in
the
central
cavity
(
hemoglobin
with
iron
,
chlorophyll
with
magnesium
,
etc
.).
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Rejected by Y-Combinator. Definitions by Wiktionary.

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