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A proteinaceous structure found within the chloroplast of certain algae and hornwort bryophytes. It is thought to be a site where carbon is concentrated.
[New Latin pȳrēna, fruit stone; see pyrene1 + -oid.]
(Biochemistry) any of various small protein granules that occur in certain algae, mosses, and protozoans and are involved in the synthesis of starch
[C19: from pyrene2 + -oid]