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Table 1 Nomenclature for representative insecticidal proteins and their encoding genes from Bacillus thuringiensis

From: Genetically engineered (modified) crops (Bacillus thuringiensis crops) and the world controversy on their safety

Old nomenclaturea New nomenclatureb Insect spectrum Number of amino acids Mass(kDa)
Gene Protein Gene Protein
cryIA(a) CryIA(a) cryIAa CyIAa Lepidoptera 1176 133.2
cryIA(b) CryIA(b) cryIAb CryIAb Lepidoptera 1155 131.0
cryIA(c) CryIA(c) cryIAc CryIAc Lepidoptera 1178 133.3
cryIB CryIB cryIBa CryIBa Lepidoptera 1207 138.0
cryIC CryIC cryICa CryICa Lepidoptera 1189 134.8
cryID CryID cryIDa CryIDa Lepidoptera 1165 132.5
cryIIA CryIIA cry2Aa Cry2Aa Lepidoptera /Diptera 633 70.9
cryIIB CryIIB cry2Ab Cry2Ab Lepidoptera 633 70.8
cryIIIA CryIIIA cry3Aa Cry3Aa Coleoptera 644 73.1
cryIIIB CryIIIB cry3Ba Cry3Ba Coleoptera 649 74.2
cryIVA CryIVA cry4Aa Cry4Aa Diptera 1180 134.4
cryIVB CryIVB cry4Ba Cry4Ba Diptera 1136 127.8
cryIVC CryIVC cry10Aa Cry10Aa Diptera 675 77.8
cryIVD CryIVD cryIIAa Cry11Aa Diptera 643 72.4
Jeg80 Jeg80 cryIIBa Cry11Ba Diptera   80
cytA CytA cyt1Aa CytIAa Diptera /others 248 27.4
cytB CytB cyt2Aa Cyt2Aa Diptera   
  1. aFrom Hofte and Whitely (1989) microbiological review, 53, 242–255
  2. bFor a complete list of crystaline proteins, see Crickmore (2017) 79