3.4.23.20	gene pepA, nucleotide sequence determined, inserted into expression vector pGPT-pyrG1, expressed in an aspartic proteinase-free strain of Aspergillus niger var. awamori	
3.4.23.20	penicillopepsin-JT1, DNA and amino acid sequence determination and analysis	
3.4.23.20	penicillopepsin-JT2, DNA and amino acid sequence determination and analysis	
3.4.23.20	penicillopepsin-JT3, DNA and amino acid sequence determination and analysis