Sentence:  In the absence of additions to the homogenate , the product formed is an iodinated particulate <WSD>protein</WSD> ( Fawcett and Kirkwood , 1953 ; Taurog , Potter and Chaikoff , 1955 ; Taurog , Potter , Tong , and Chaikoff , 1956 ; Serif and Kirkwood , 1958 ; De Groot and Carvalho , 1960 ) . 
Meaning of the word marked with <WSD> tags:  any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes