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“We found that the addition of histidine to thiamine-free medium, in which CPY production was almost negligible, raised the intracellular thiamine level, resulting in the increase of CPY production.”
Applied Microbiology and Biotechnology • 1998 | View Paper
“In the presence of histidine , inhibition is more severe and is relieved by a combination of thiamine , glycine, uridine (or cytidine), and inosine (or guanosine).”
“Phenylalanine and histidine , out of several amino acids tested by the addition to the growth medium of Escherichia coli, showed stimulatory effects on thiamine production by the cells.”