The results showed that Amy2b, metallothionein 1 (Mt1), Tff2, Klk1, deleted in malignant brain tumors 1 (Dmbt1), glycoprotein 2 zymogen granule membrane (Gp2), Cel, Clps, ribonuclease, RNase A family, 1 (pancreatic, Rnase1), and Spink1 were particularly abundant in unknown EC 1 (Figure 5b). Here, KLK1 is linked to brain cancer.