Show I I. I i Commercial Penicillin ill m mI I I According to a joint statement 1 made by the United States Public I Health service the United States Stat s Food and Drug administration and the committee ommittee on medical research of the commercial penicillin i lin tin is not a single substance but butI i a mixture of several identified by bythe I the letters G X F and K Much commercial penicillin contains K j i which is said to be relatively inefficacious inefficacious inefficacious j t against the several infections infections infections against which it has been ex- ex experimentally I 1 I studied because of I the ease with which it is destroyed I 1 I Lin in the body |