TF and metastatic melanoma: Other cells where it is found are sertoli [19], oligodendroglia [20], myocytes [15], pneumocytes [18], nephrons [21], parietal cells [22], immune cells [23], and cancer cell lines such as human breast and metastatic melanoma [24]; it is also found in bodily fluids such as plasma [9], lymph [23], amniotic fluid [25], cerebrospinal fluid [26], colostrum, and milk [21].Transferrin + 2Fe3+ ⇌ Transferrin(Fe3+)2.