Characterization of a multimeric, eukaryotic prolyl aminopeptidase: an inducible and highly specific intracellular peptidase from the non-pathogenic fungus Talaromyces emersonii, by C. S. Mahon, A. J. O'Donoghue, D. H. Goetz, P. G. Murray, C. S. Craik and M. G. Tuohy