Genes encoding the six proteases were cloned from the library using the combination of several gene cloning strategies, and four genes, sfp1, sfp2, sfp3 and sfap, have been registered in EMBL (Accession number: AJ784159, AJ784940, AJ810091, and AJ781828).

• 利用多种基因克隆技术组合,克隆得到了六种蛋白酶基因sfp1,sfp2,sfp3,sfap,sfp4和sfp5(其中四个基因sfp1,sfp2,sfp3和sfap已在EMBL注册,注册号分别为AJ784159,AJ784940,AJ810091和AJ781828)。