Leukocyte chimerism of B⁺ SCID patients after BMT. Microsatellite typing of polymorphonuclear cells (PN), T lymphocytes (T), natural killer cells (NK), B lymphocytes (B), and monocytes (M) from recipients (R) or from donor cells (D) was performed at the D10S206 (A), DXS101 (B), or HPRT (C) loci, depending on how informative the locus was for each subject. (A) UPN 299; (B) UPN 272b; (C) UPN 223.