looked at the protective effect of Navicula incerta peptides Pro‐Gly‐Trp‐Asn‐Gln‐Trp‐Phe‐Leu (NIPP‐1) and Val‐Glu‐Val‐Leu‐Pro‐Pro‐Ala‐Glu‐Leu (NIPP‐2) against liver disease.[83] Peptides NIPP‐1 and NIPP‐2 were purified from N. incerta protein hydrolysate and their inhibitory effects on collagen release were examined in hepatic stellate LX‐2 cells with transforming growth factor (TGF)‐β1‐activated fibrosis.[83] NIPP‐1 peptide dose‐dependently prevented elevations in matrix metalloproteinase levels and inhibited TIMP metallopeptidase inhibitor 1 production. Here, PPP1R8 is linked to liver disorder.