But some of the most promising work is coming from cell biologists who have become expert in cloning trees.
Professor Holtzman was a cell biologist and researcher and a popular teacher for 28 years.
When these findings were first published, in the late 1980's, cell biologists immediately recognized their significance for hormone pharmacology.
It was not until 1960 that cell biologists deliberately fused cells for the first time.
There are three methods that cell biologists use to fuse cells.
"For cell biologists, finding them was just like pulling a blind up."
He is a cell biologist at the University of Pittsburgh.
Larry Schulenberg, another of the project's top cell biologists, rolled into the empty laboratory in his wheelchair.
His work as a cell biologist has centered on genetics and the use of genetic methods to understand biological functions.
Her father is a cell biologist at New York University.