The growth of our CR2 cells was examined on several commercially available microcarriers. The range used included the following: -Cytodex 1 (Pharmacia), Cytodex 2 (Pharmacia), Cytodex 3 (Pharmacia), Cultisphere (Cellon Sarl), Cytopore 1 (Pharmacia), Cytopore 2 (Pharmacia), Cytoline 2 (Pharmacia) and FACT (Solohill).