Evidence that SE is distal to LU on chromosome 19q

Abstract
Analysis of a family informative for chromosome 19 loci establishes that the Lutheran blood group locus (LU) lies between the third component of human complement (C3) and the secretor loci (SE). Previously published lod scores for C3:LU are increased from 2.94 to 3.80. The linkage relationship (.cxa.z and .cxa..theta.) between C3, LU, and SE are examined,and the proposed order and approximate genetic distances are determined to be: pter - - C3 - 10.6cM - cen - 7.4cM - LU - 9cM - SE -- qter.