Typical PAGE fingerprints showing usage of V_H families in V_H-(D)-J_Hrearrangements.

(A) Full fingerprint of normal BM; film exposed for 24 hours. (B) Darkened sections from panel A for visualization of faint bands. (C) Film exposed for 10 days and showing blank control. (D) Adult ALL consisting of a major V_H3-positive clonal population; 24 hours' exposure.