Table 1.

Number of proteases in related Acari.

Protease Type	D. pteronyssinus	D. farinae	S. scabiei
Threonine Proteases	18	20	17
Serine Proteases	133	88	76
Metalloproteases	127	94	83
Cysteine Proteases	77	60	61
Aspartyl Proteases	14	5	6
Total	369	267	243