all enamel organ epithelia were found to incorporate tryptophan and silver grains were identified ( above background ) in the extracellular matrices ( ecm ) of the enamel matrix , non-enamel occlusal cusp adjacent to the inner enamel epithelia , and the ecm ( 2-4 , micron ) adjacent to presumptive root furcation and hers regions .
C0011350
enamel
C1512780
inner enamel epithelia