From NCBI, a US government source, so public domain. Copyright info is here. The site is this.
Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.
| | | | | | | | | | | | | | | +/-
(from http://en.wikipedia.org/w/index.php?title=Image:Cell_differentiation.gif)
الصفحات التالية تحتوي على وصلة لهذه الصورة: