Figure 2 indicates the occupancy and glycan structure on each N-glycosylation site of endogenous EGFR in A431 human epidermoid carcinoma cells [15], recombinant EGFR, which is expressed in CL-1 human lung cancer cells [16], and recombinant soluble EGFR (sEGFR, the extracellular domain of EGFR) expressed in CHO-K1 cells [17]. The gene discussed is EGFR; the disease is squamous cell carcinoma.