Mouse enamelysin (Mmp20), a member of the matrix metalloproteinase (MMP) fa
mily of extracellular matrix degrading enzymes, shows a high degree of homo
logy with other MMPs, particularly those of the stromelysin/collagenase sub
families. It is expressed exclusively in ameloblasts and odontoblasts. The
mouse enamelysin gene (Mmp20) is made up of 10 exons spanning approximately
65 kb within the MMP gene cluster at the centromeric end of chromosome 9.
(C) 1999 Academic Press.