By comparison with receptor-positive HeLa human cervical carcinoma cells, the M6P/IGF2R content of FRL14/IGF2R wt-1 and FRL14/IGF2R wt-2 cells was estimated to be 2.5 and 2.1 pmol/mg total cell protein, respectively (Supplementary Table 1). Here, IGF2R is linked to cervical carcinoma.