Sentence:  These conjugates * * f had much less nonspecific staining than the previous <WSD>conjugate</WSD> ( with 50 mg FITC per gram of globulin ) while the specific staining was similar in both cases . 
Meaning of the word marked with <WSD> tags:  a mixture of two partially miscible liquids A and B produces two conjugate solutions: one of A in B and another of B in A