the alpha chain of this haptoglobin species differs from ordinary haptoglobin 1 and 2 alpha chains both structurally and immunologically and represents the product of the hpr gene , haptoglobin-related protein ( hpr ) , since ( i ) the apparent molecular mass is the same as that predicted for hpr alpha chain , ( ii ) the peptide map differs from that of haptoglobin 1 in a manner predicted by the hpr nucleotide sequence , ( iii ) monospecific antibodies that react with epitopes shared by the unique alpha chain and a synthetic peptide derived from the hpr nucleotide sequence do not detect these epitopes in either haptoglobin 1 or 2 , and ( iv ) sequences of alpha-chain peptides were consistent with this identification , excluding haptoglobin 1 but not haptoglobin 2 .
C0062120
haptoglobin-related
C1337105
hpr