Analysis of microsatellite instability of hematopoietic tumor cell lines. DNA purified from each cell line was analyzed for heterogeneity at the microsatellite locus D18S58. Lanes 1 through 8 are normal lymphocytes, U937, KCL22, CEM, P30OHK, HEL, HL60, and SKH1, respectively. Multiple alleles were particularly evident in KCL22, but could also have appeared in CEM and P30OHK.