Sentence:  A study of their activity on thyroglobulin has shown that thyroxine is not preferentially <WSD>released</WSD> and that the degradation proceeds stepwise with the formation of macromolecular intermediates ( Alpers , Petermann and Rall , 1956 ) . 
Meaning of the word marked with <WSD> tags:  generate and separate from cells or bodily fluids