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ES-MS of fatty acids from the mutant 155NS1. Fatty acid p-bromophenacyl esters from HPLC were collected and resaponified to remove the p-bromophenacyl group. The resultant free fatty acids were subjected to EM-MS analysis. We show here the spectrum of fatty acids derived from fraction C of HPLC (peaks 3–6 of Fig. 3A).
