Human lymphoid cells of the intestinal mucosa showing specificity for both immunoglobulin light and heavy chains.

The presence of single human lymphoid cells expressing on the one hand both kappa and lambda light chain and on the other hand either both mu and alpha or both mu and gamma heavy chains, was observed in the intestinal mucosa. The variability of the frequency of such cells, both from one subject to another, or in the same sample, is a characteristic of this population.