Fig. 3.

Examples of HPLC profiles of acid/alkali extracts of four different types of microorganisms. Washed cell pellets, prepared as described in the Methods, were subjected to the standard acid/HPLC protocol. a S. cerevisiae (baker’s yeast); b E. coli (gram-negative bacterium); c B. subtilis (gram-positive bacterium); d M. smegmatis, (bacterium with a waxy cell wall). Numbers near the peaks refer to the identity of known components, listed in the legend to Fig. 1