It is possible that Mtx1 proteins from other B. sphaericus
strains are also conserved. Other Mtx proteins from
different B. sphaericus strains also showed high homology.
Mtx2 proteins from eight strains showed more than
97% identities [3], and only a single amino acid difference
was detected in Mtx3 proteins from nine B. sphaericus
strains [9].