Human early pregnancy factor: application of the monoclonal antibody anti-HuLyt 3 in the rosette inhibition test and in a cellular radioimmunoassay.

Using the monoclonal antibody anti-HuLyt 3, raised rosette inhibition titres were observed when lymphocytes were preincubated with early human pregnancy sera, although this was not a consistent finding. Results obtained from a cellular radioimmunoassay suggest that this enhancement of rosette inhibition is not due to interference with antibody binding.