�y��vlog

Margaret spent her fourth year working in Dorothy's lab on a crystal of the molecule Gramicidin S, which had been grown in the Soviet Union and sent to Dorothy for analysis.

Gramicidin is not a mold extract, but is produced by bacteria.

The development of penicillin was independent of our work with gramicidin.

By this method and refinements of it, he at last found, in a sample of cranberry bog soil sent to him by Waksman, an organism from whose cultures he separated an active fraction that he named gramicidin.

In spite of such failings, gramicidin touched off a chain reaction.