Objective To evaluate characteristics of hematopoietic and immunologic reconstitution in mixed cord blood transplantation. Methods Single, 2 human HLA-haploidentical or HLA-mismatched cord blood units were transplanted into sublethally irradiated severe combined immunodeficiency (SCID) mice, respectively. The characteristics of engraftment, multilineage hematopoiesis and immunologic reconstitution among the three guoups were compared. Results Single or 2 cord blood units could engraft SCID mice and reconsti...