Representative micrographs of ampicillin-treated cells.

<p>For controls, dividing cells in the medium without ampicillin are shown (a1–3). When crescent-shaped cells (a1) enter the division process, chloroplasts started to divide (a2). After septum formation, two new semicells with two chloroplasts appeared (a3). In the medium with 100 µM ampicillin (b1–6), various types of cells were observed. There were normal crescent-shaped cells with two chloroplasts (b1), dividing cells without chloroplast division (b2), divided semicells with only one chloroplast (b3), crescent-shaped cells with one chloroplast (b4), long cells with irregular chloroplasts (b5) and dead cells (b6). The magnification in those photos without a scale bar is the same as that in a1.