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.
Proliferation assay of stem cells from apical papilla cultured in four media from days 2 to 10. The results are presented as mean ± standard deviation. (A-PRF+, advanced platelet-rich fibrin plus; i-PRF, injectable platelet-rich fibrin; D, day; ∗P < 0.05, ∗∗P < 0.01).
