Nuclear activity and cell division in the microcysts of Myxococcus fulvus demonstrated by electron micrography of sections.

Electron micrographs of sectioned fruiting bodies confirm that, in Myxococcus fulvus, approximately 10% of mature microcysts show appearances interpretable as typical bacterial nuclear activity and cell division. This suggests a simple mechanism for fruiting body development, and its existence bears upon the validity of the classical descriptions of microcyst maturation in myxobacteria.