CTSL and fascioliasis: According to previous studies, several proteins have been investigated for their potential as vaccines against fasciolosis, including Fatty acid-binding protein (FABP) (10), Saponin-like protein-1 (SAP-1) (11), Saponin-like protein-2 (SAP-2) (12), Glutathione S-transferase (GST) (13, 14), Leucine aminopeptidase (LAP) (15), Hemoglobin (16), Peroxiredoxin (Prx) (17, 18), Superoxide dismutase (SOD) (19), Cathepsin L1 (CatL1) (20–22), Cathepsin L1H (CatL1H) (23), Cathepsin L1G (CatL1G) (24), Cathepsin B2 (CatB2), and Cathepsin B3 (CatB3) (7).