Disease: Acute lymphoblastic leukemia; B cell precursor leukemia Origin: Established from the bone marrow of a 32-year-old woman with acute lymphoblastic leukemia (ALL L2) in first relapseSpecies: Homo sapiens Tissue:Bone marrow Morphology:Lymphoblast Properties: Suspension; single, relatively small, round cells Cytogenic data: human hyperdiploid karyotype - 47/48<2n>X/XX, +8, +18, t(4;11)(q21;q23), i(7q) - sideline without +8/18 - carries MLL-AFF1 (MLL-AF4) fusion gene - resembles published karyotype Patient: Female, Caucasian, 32 yrs of age Medium: RPMI-1640 Medium + 10% FBS Subculture: Cultures can be maintained by the addition of fresh medium or replacement of medium. Alternatively, cultures can be established by centrifugation with subsequent resuspension at 0.5 X 10^6 viable cells/mL. Split saturated culture 1:3 to 1:4 every 3-4 days; Maximal density of about 4.0 x 10^6 cells/ml; 5% CO2; 37°C Freezing Medium:Complete culture medium supplemented with 5% (v/v) DMSOBiosafety Level:I Sterility:Bacteria: Negative Yeast: Negative Mycoplasma: Negative Pathogens:HIV: Negative Hepatitis B: Negative Hepatitis C: Negative DNA Profile (STR): Amelogenin: X; CSF1PO: 11,12; D13S317: 11; D16S539: 11,12; D5S818: 12,13; D7S820: 8,12; THO1: 6,9.3; TPOX: 8; vWA: 14,17 References for RS4;11 cells:1. Drexler, H. G., Quentmeier, H., MacLeod, R. A. (2004). Malignant hematopoietic cell lines: in vitro models for the study of MLL gene alterations. Leukemia : official journal of the Leukemia Society of America, Leukemia Research Fund, U.K 18 ( 2 ): 227-232. images/sell/14671638 2. Stong, R. C., Korsmeyer, S. J., Parkin, J. L., Arthur, D. C., Kersey, J. H. (1985). Human acute leukemia cell line with the t(4;11) chromosomal rearrangement exhibits B lineage and monocytic characteristics. Blood 65 ( 1 ): 21-31. images/sell/3917311 2n>