Plastid

Patent Pending The plastid (Greek: πλαστός; plastós: formed, molded – plural plastids) is a major double-membrane organelle [1] found, among others, in the cells of plants and algae. Plastids are the site of manufacture and storage of important chemical compounds used by the cell. They often contain pigments used in photosynthesis, and the types of pigments present can change or determine the cell's color. They have a common origin and possess a double-stranded DNA molecule, which is circular, like that of prokaryotes.