chromatophores of Paulinella chromatophora are considered bona fide organelles (= plastids ) rather than temporary endosymbionts are the apparent regulation of organelle division by the amoeba and the reduction by 2/3 (i.e., from ca. 3 Mb in free−living Prochlorococcus / Synechococcus cyanobacteria to circa 1.0 Mb in the Paulinella chromatophora )