In the present study, we revealed that lysosomal-related acid hydrolases (e.g., proteases, glycosidases and sulfatases) and integral membrane proteins (e.g., lysosomal-associated transmembrane proteins and lysosome-associated membrane glycoprotein) were highly expressed in MT1+2 and MT4 (Additional file 11: Table S5; Additional file 12: Figure S7), which are known or speculated to be involved in cellular responses to inflammation and pathogenic infection [43]. This evidence concerns the gene MT4 and infection.