Sentence:  A typical <WSD>MMP</WSD> consists of a propeptide of about 80 amino acids, a catalytic metalloproteinase domain of about 170 amino acids, a linker peptide of variable length (also called the hinge region), and a hemopexin (Hpx)-like domain of about 200 amino acids. 
Meaning of the word marked with <WSD> tags:  Matrix metalloproteinase