A proteinaceous structure associated with algal chloroplasts that often forms storage compounds
PIE-re-noyd A starch-containing large chloroplast in a green alga. 465
A region of starch formation found in the chloroplasts of various algae, for example, Cosmarium.
An area of starch formation found in the chloroplasts of certain algae.
In cell biology, pyrenoids are centers of carbon dioxide fixation within the chloroplasts of algae and hornworts. Pyrenoids are not membrane-bound organelles, but specialized areas of the plastid that contain high levels of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubis CO).