pip·syl (Ips),

p-Iodophenylsulfonyl, the radical of pipsyl chloride that combines with the amino groups of amino acids and proteins.
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(22), although they were distinguished therefrom by the use of reagents (i.e., antibodies) of much higher specificity than the labeled organic substances (e.g., acetic anhydride and, later, pipsyl chloride) used by Tait and his co-workers.