SIVmac₂₃₉-Nef down-regulates cell surface expression of CXCR4 in tumor cells and inhibits proliferation, migration and angiogenesis. - Cai C; Rodepeter FR; Rossmann A; Teymoortash A; Lee JS; Quint K; DI Fazio P; Ocker M; Werner JA; Mandic R (Anticancer research, 2012)