Sentence:  Similarly , both types of <WSD>antibodies</WSD> were found in three regions of the chromatographic eluate , having extremely low , low , and high anionic binding capacity , respectively ( Fig. 3 ) . 
Meaning of the word marked with <WSD> tags:  any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response