| haptoglobin phenotyping from older bloodstains by enzyme immunoassay and haptoglobin phenotypes within a nebraska caucasian population. | enzyme immunoassay and western blotting (electrophoretic) techniques were used to determine haptoglobin (hp) phenotypes from older bloodstains. serum was collected from liquid blood and the hp phenotypes were determined. bloodstains were prepared from these specimens and stored at various temperatures for several months. the stains were extracted and applied to gradient polyacrylamide gels. the western blotting technique was used to achieve the transfer of hp bands from the gels to the nitrocell ... | 1991 | 2066732 |