Fig. 2. Streptomyces developmental cycle in liquid cultures.
(a) Mycelial pellet of Streptomyces antibioticus ATCC11891 stained with SYTO 9/propidium iodide and observed under the confocal microscope. (b) Cell-cycle features (see Fig. 1): MI, first compartmentalized mycelium (newly described structure); MII, second multinucleated mycelium (formerly, substrate mycelium).