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.
Microphotographs of 2nH1 (a) and 4nH1 cells (b, c and d) growing exponentially. Cells were stained with haematoxylin–eosin (a and b) or for alkaline phosphatase activity (c and d). Photograph d is a negative control in which cells were stained without substrate. The inserts in c and d show phase‐contrast microphotographs of the respective main fields.
