The authors studied Pi polymorphism using the Separator isofocusing method with slight modification. A new Pi allele was observed. Family pedigrees confirmed co-dominant inheritance with other Pi alleles. According to the electrophoretic mobility of its isoprotein bands, and to its frequency (0.04) this new allele is considered as a fourth Pi M subtype: Pi M4.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/6969686