passages.id: split_8_test_1226_passage
passages.type: progene_text
passages.text: It is not clear how the diverse receptors are generated in a single individual , but a comparison of amino acid sequences of p70 KIR family members suggested that some of them may be encoded by distinct genes or their alleles , while others may be generated by a recombination mechanism and/or an alternative splicing mechanism at the maturation of the mRNA transcripts .