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CXCR4 , CXCR7, CXCL11 and CXCL12 expression in five oestrogen receptor–positive human breast cancer cell lines adapted to long-term oestrogen deprivation. Expression of CXCR4 (A), CXCR7 (B), CXCL11 (C) and CXCL12 (D) in wild-type (WT) and their corresponding long-term oestrogen-deprived (LTED) cell lines. CXCR, C-X-C chemokine receptor; CXCL, C-X-C chemokine ligand. Bars represent – standard error of the mean (SEM) *P<0.05 ** P<0.01, ***P<0.001
