WB (peptide competition) analysis of HEK293 cells treated with EGF (Lane 2-6) using GTX17944 RPS6 (phospho Ser236) antibody prior incubated with the phosphopeptide corresponding to ribosomal protein S6 (pSpS244/247) (Lane 3), the non-phosphopeptide corresponding to the immunogen (Lane 4), a generic phosphoserine-containing peptide (Lane 5), or, the phosphopeptide immunogen (Lane 6) control. The data show that only the immunogen phosphopeptide blocks the signal, demonstrating the specificity of the antibody.