the formation and reversion of spheroplasts of the diaminopimelic acid-auxotrophic mutant escherichia coli k 12 , 335 , dap- , r+tem in a medium lacking diaminopimelic acid have been investigated by microphotography : during their development from rod form cells to spheroplasts cells on slide-surface-agar preparations underwent two successive cell divisions in the course of which the cells retained their rod form .
C0007590
cell divisions
C0007634
cells