CXCL6 and melanoma: Immunodepletion of either GCP‐2 or ENA‐78 from CM of senescent fibroblasts with neutralizing antibodies against GCP‐2 or ENA‐78 showed a significant concentration‐dependent inhibition of the migratory response of melanoma cells, with a maximum of 75% inhibition in the presence of GCP‐2 neutralizing antibodies (10 and 100 μg) (Figure S7C) and a maximum of 50% inhibition in the presence of ENA‐78 neutralizing antibodies (10 and 100 μg) (Figure S7D).