L-alpha-aminoacyl-L-histidine(out) <=> L-alpha-aminoacyl-L-histidine(in)
l-alpha-aminoacyl-l-histidine(out) <=> l-alpha-aminoacyl-l-histidine(in)
L-alpha-aminoacyl-L-histidine(out) <=> L-alpha-aminoacyl-L-histidine(in)
l-alpha-aminoacyl-l-histidine(out) <=> l-alpha-aminoacyl-l-histidine(in)