3.4.24.B6 cytoplasm mainly cytosolic in the presecretory and late stage ameloblasts and odontoblasts 5737 669698 3.4.24.B6 extracellular - - 712586, 712590 3.4.24.B6 extracellular in enamel matrix of teeth - 651185 3.4.24.B6 extracellular MMP-20 is synthesized and secreted by ameloblasts - 712555 3.4.24.B6 extracellular MMP20 is secreted - 712589 3.4.24.B6 extracellular matrix - 31012 712587 3.4.24.B6 nucleus mainly nuclear in the presecretory ameloblasts and odontoblasts 5634 669698 3.4.24.B6 rough endoplasmic reticulum - 5791 669698 3.4.24.B6 vesicle - 31982 669698