Matrix metalloproteinases (MMPs) are zinc-containing endopeptidases. They degrade proteins by cleavage of peptide bonds. More than twenty MMPs have been identified and are separated into six groups based on their structure and substrate specificity (collagenases, gelatinases, membrane type [MT-MMP], stromelysins, matrilysins, and others).
Confidence votes 164. Alleles are the different forms of a gene. Alleles are corresponding pairs of genes located at specific positions in the chromosomes. Together, alleles determine the genotype. Alleles which determine some aspect of the phenotype, the physical appearance of an organism, are said to be coding alleles.
A gene is a stretch of DNA that codes for a polypeptide via an RNA chain. These coded chains lead to âtraitsâ in an individual, such as eye color and blood type. A gene is the basic unit of heredity. An allele is a variation of a gene. Genes come in many different forms, or alleles, that lead to the encoding of different RNA chains and, therefore, different traits.