Comparisons of mass spectral
data of tryptic peptides also show a clear difference between the
profiles of the two deposited M. luteus (ATCC 4698 and 49732),although the environmental strains were remarkably similar.
Further investigations are warranted to determine whether these
two ATCC strains and possibly others (displaying an amino acid
substitution in aconitate hydratase) are distinct biovars or species
within the genus Micrococcus.