the titer of pci antigen , as measured by an electroimmunoassay using a monospecific anti-pci serum , was 5.3 +/- 1.6 micrograms/ml in the patients ' plasma and was not significantly different from that of normal plasma ( 5.3 +/- 2.7 micrograms/ml , n = 30 ) .
C0229671
serum
C0032105
plasma