[Preparation of peptide maps of sheep fetus haptoglobin using immobilized trypsin]

A comparison of peptide maps of sheep foetus haptoglobin (Hp) phenotypes revealed a significant difference in 6 peptides. The map of multicomponent Hp2 shows the presence of a group of neutral peptides, which was absent in the case of a single-component Hp1. This difference is probably due to the presence of the alpha-subunit in Hp2.