Fig. 5. PMA induced increases in MHC-A and MHC-B phosphorylation of TSU-pr1 cells, whereas calphostin C inhibited this phosphorylation. Images obtained from the PhosphorImager of MHC-A and MHC-B phosphorylation without any treatment (NT) and after the addition of 7 ng ml^-1 EGF, 200 nM PMA or 7 ng ml^-1 EGF and 100 nM calphostin C (calC). The experimental conditions and analysis of the phosphorylation levels were as in Fig. 3.