ESI MS tryptic peptide maps.

(A) γ chains showing (from top) purified γ^A from the propositus, purified γ^D chains from the propositus, and γ^A chains from a control. Note the disappearance of 1261 and 841 m/z ions and their replacement by ions at 1254 and 836 m/z. (B) Mixture of Bβ^D/Bβ^A from propositus and Bβ^A chains from a control. Note the 50% decrease of the 1129 m/z ion and the appearance of a new ion at 985 m/z.