Immunohistochemical labeling of adult Onchocerca flexuosa with polyclonal antibodies against keyhole limpet hemocyanin (KLH). Keyhole limpit hemocyanin was used as a carrier protein to generate antibodies against putative Wolbachia-like peptides. Antibodies against this carrier failed to bind specific tissues in female (A) or male (B) worms. Abbreviations: cu, cuticle; hy, hypodermis; m, muscle; lc, lateral chords; mc, median chords; i, intestine; ut, uterus; t, testis. Scale bar = 50μm.