Leukemic cell surface markers implicated in EM homing. Blast cell CD56 (neural cell adhesion molecule) expression has been associated with both MS and LC. Homing of blast cells into the skin may be mediated through interactions between lymphocyte function-associated antigen-1 (LFA-1) and intercellular adhesion molecule-1 (ICAM-1) and/or cutaneous leukocyte antigen (CLA) and E-selectin.