The correct reference is “Amersi, F.F.; Terando, A.M.; Goto, Y.; Scolyer, R.A.; Thompson, J.F.; Tran, A.N.; Faries, M.B.; Morton, D.L.; Hoon, D.S., Activation of CCR9/CCL25 in cutaneous melanoma mediates preferential metastasis to the small intestine. This evidence concerns the gene CCR9 and cutaneous melanoma.