FOLH1 and neoplasm: PC3(+) tumor membrane preparations exhibited high PSMA expression levels [Bmax = 13.95 ± 1.60 fmol/μg of protein, n = 5] with [18F]DCFPyL which compared favorably with the Bmax values determined from similar saturation assays with the other four tracers, [18F]1a–b, 2a–b.