Substitution of three of the four conserved histidines has no effect on the heme content of this fragment, whereas a fourth histidine substitution, H105A, prevented heme from combining with protein expressed hinein E. coli Name your collection: Name must be less than 100 characters Choose a collection: Unable to load https://mutagenesis21976.wikiusnews.com/314161/the_definitive_guide_to_site_directed_mutagenesis