Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Polarized light micrograph of a section through the mesial cusps (protoconid on left) of the Gorilla gorilla M1 (specimen ZSM 1913/1163). (A) Entire section and (B) magnified view of the protoconid cusp showing the neonatal line (red arrows) in the enamel. (C) Magnified view of the lateral enamel illustrates a series of successive striae of Retzius (white arrows) that appear as black lines running from the outer enamel surface (left) toward the dentine (lower right).
