[Determination of the A1 and A2 subgroups in hair]

The authors discuss possibilities of assessment of group substances (sub-groups) A1 and A2 and A1B and A2B resp. in hair by means of serum anti -A1 and lectin anti-H. It was found that in some instances this assessment is successful, however, introduction into common practice is so far, e. g. without the use of monoclonal sera, hardly possible. Possibilities of detection are influenced by several factors, obviously in particular by the quantitative expression of the group substance in hair, by the quality of the sera used (lectins) and indicator blood cells.