The invention concerns the use of a PyA-(Z).sub.x-pNF group in a substrate for detecting, identifying and/or analyzing by fluorometry peptidases or proteases capable of cleaving the or a bond between a PyA and pNF and/or compounds with inhibiting or activating activity with respect to enzymes capable of cleaving said bond.

 
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> Yeast cells engineered to produce pheromone system protein surrogates, and uses therefor

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