1
Ure Collection (ATCC, Manassas, VA); RPMI 1640 medium and PBS were purchased from BioWhittaker (Walkersville, MD); Gentamycin, penicillin/streptomycin, macrophage-colony stimulating factor (M-CSF), and Polybrene were obtained from Sigma (St. Louis, MO); MethoCultTM GF M3434, semi-solid medium was obtained from StemCell Technologies (Vancouver, Canada); DiffQuik, a modified Wright-Giemsa stain was