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.
Hematoxylin and eosin-stained cross-sections of demineralized formalin-fixed paraffin-embedded mandibular incisors at the level of the molar mesial root in A/J (a, b) and 129P3/J (c, d) parental strains treated with 50 ppm F (b, d) or 0 ppm F (a, c). E = Enamel zone; D = dentin.
