In our experience15 and in that of most other investigators,5”3 1gM is the
main Ig class on peripheral blood lymphocytes of normal individuals. Our
figures are the following: 5%-25% of lymphocytes positive for p. chains
(mean 13), 1%-7% positive for y chains (mean 4), o.5%-4% positive for a chains (mean 2); 10%-15% (mean 12.5) and 2%-7% (mean 4) positive
for K and A chains, respectively.