The relative amounts of the polar lipids of C. sporogenes were determined as previously described for the lipids of Clostridium tetani.Briefly, triplicate 10 ml cultures were prelabelled with 10 µCi (370 kBq) [1- 14C]acetate and grown overnight. The cells were harvested by centrifugation and the lipids extracted with chloroform/methanol. They were subjected to 2D-TLC as described above and quantified with a phosphorimager.