Figure S1: Coefficient of variation telomerase assay. Figure S2: Telomerase assay controls Figure S3; Serial dilution, limit of detection telomerase assay, Figure S4; Protein extraction and assay performance; Figure S5; Lack of telomerase activity in supernatants. Figure S6; input protein and telomerase activity. Figure S7; Discovery set cyst fluid results effects of thawing. Figure S8 discovery set cyst fluid results. Figure S9 validation set results. Figure S10; telomerase results in previously thawed cyst fluids. Figure S11; Telomerase activity in all discovery set samples. Figure S12; Effect of cyst fluid on telomerase activity. Figure S13; SCN telomerase activity and cyst fluid appearance. Figure S14; Pathologic diagnosis according to cyst imaging group (high risk, worrisome etc). Figure S15: telomerase activity in EUS FNA samples