“…Differences have been demonstrated by other methods only in respect to the light chains (Harboe et al 1962). Differences in the heavy chains are not sufficiently demonstrated in spite of many reported cases (Putnam 1959, Adelson 1961, Heremans & Heremans 1961, Fine 1962 Curtain et al 1959Fine et al 1961 Heremans 196 1 Debray-Sachs 1962 Imhof et al 1963Kjeldsen et al 1963Scheulen 1964Clausen et al Cawley et al 1965Kistner et al 1965Bachmann 1965Costea et al 1965Ditmar et al 1965Welter et al 1966Bachman 1966Axelson et al 1966Radel et al 1966Kjeldsen 1967Odeberg et al 1967Laurell et al 1967 Korngold 1967 stensen 1964, Vaerman et al 1965, Gillert et al 1968), as the occurrence of polymers and complex formations cannot be ruled out. The Gm genotypic specificity and the recently demonstrated immunological sub-groups We, Vi, Ge, and Ne may perhaps be used to differentiate between these M components (Grey & Kunkel 1964).…”