BSC 40 (ATCC; CRL2761), Chinese Hamster Ovary (CHO-K1) (ATCC; CCL61), and MC57G mouse fibroblast cells (ATCC; CRL2295) were maintained in DMEM (Corning) supplemented with 10% Fetal Bovine Serum (FBS) (Hyclone). A20 mouse B lymphoma cells (ATCC; TIB208) were maintained in RPMI 1640 (Corning) supplemented with 10% FBS. 293-F human embryonal kidney cells (Thermo Fisher Scientific; Cat.#: R79007) were maintained in 293 expression media (Thermo Fisher Scientific; Cat.#: 12338026).
VACV (Western Reserve) and CPXV (Brighton Red Strain; BR) recombinants were propagated in BSC40 cells maintained in MEM (Corning) supplemented with 5% FBS. Viruses were purified utilizing standard protocols, as we have previously reported [16].
BW5147 mouse thymoma cells (kindly provided by Ofer Mandelboim, Hadassah Hospital, Jerusalem, Israel) were maintained at 3x105 to 9x105 cells/ml in RPMI GlutaMAX (Gibco) supplemented with 10% (vol/vol) FCS, sodium pyruvate (1x, Gibco) and β-mercaptoethanol (0.1 mM, Sigma). Generation of BW5147 reporter cells stably expressing chimeric mouse FcγRs is described elsewhere [58].
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