Fig. 1

Morphological studies of BRCS1 on the left (a–d) and BRCS2 on the right (e–h). a, e Respective colony morphology on NMS agar plates. b, f Phase-contrast photomicrograph at ×100 magnification. c, g Transmission electron photomicrograph of single cells at ×60,000 magnification. d, h Transmission electron photomicrograph at ×4200 and ×8200 magnification, respectively. c The dumbbell-like shape with a head- and tail-like part. α) The head part includes a light-transmissive granule thought to consist of the storage compound PHB. β) The tail part show striata which are believed to be the ICM. g A single coccus-shaped cell with a big light-transmissive granule (α) also thought to consist of the storage compound PHB