All parasite strains, including parental RHΔhxgprt, TgSKP1SF [20 (link)], TATiΔku80 [67 (link)] and RHΔhxgprtΔku80) strains [68 (link)], were maintained in human foreskin fibroblasts (ATCC; Manassas, VA) in Dulbecco’s Modification of Eagle’s Medium (DMEM) (VWR; Radnor, PA) supplemented with 10% fetal bovine serum (VWR), 2 mM L-glutamine (VWR), and 100 IU/ml penicillin– 100 μg/ml streptomycin (VWR). Parasites were released from host cells by passage through a 27-gauge needle [69 (link)]. All parasite strains and host cell lines were routinely tested for Mycoplasma contamination with the MycoAlert Mycoplasma Detection Kit (Lonza, Basel, Switzerland) and found to be negative.
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