| Ngn2-BamHI-F | 5′-GGG GGATCC ATGTTCGTCA AATCTGAGA-3′ |
| Ngn2-KpnI-myc-EcoRI-R | 5′-CCCGAATTCT CACAGATCCT CTTCAGAGAT GAGTTTCTGC TCGGTACCGA TACAGTCCCT GGCGAGGG-3′ |
| ND1-BamHI-F | 5′-GGTGCCTTGCTATTCTAAGACGC-3′ |
| ND1-EcoRI-R | 5′-GCAAAGCGTCTGAACGAAGGAG-3′ |
Note: F, Forward primer; R, Reverse primer.