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.
Effects of all-trans-retinoic acid (ATRA), 6-mercaptopurine (6MP) and methotrexate (MTX) on the (a) clonogenic growth of and (b) CD15 expression by NB4 cells. Results represent the mean±s.e.m. of four separate experiments. P-values are for individual treatment groups compared to control.
