Pyrenoid A protein structure found in the chloroplasts of green algae and hornworts (Anthocerophyta). Pyrenoids are associated with the storage of starch.

• 淀粉核，蛋白核：在绿藻和角苔（角苔门）的叶绿体中所发现的蛋白质结构。淀粉核与淀粉的储存有关。