Localization of CsMRP4 in C. sinensis adults (a, b, d, e) and metacercariae (c, f) detected by immunohistochemistry. Top panels (a - c) were stained with mouse anti-NBD1 immune serum and bottom panels (d - f) were stained with normal mouse serum. Abbreviations: EB, excretory bladder; MT, mesenchymal tissue; OS, oral sucker; T, testis; VS, ventral sucker