The cDNA numbering starts with 1 at the A of the start codon. This position corresponds to nucleotide position 789 in the NCBI cDNA sequence. NM_000553
| cDNA Exon | Size | |
| Exon | Location | (bp) |
| 1 | 1-155 | >155 |
| 2 | 156-327 | 172 |
| 3 | 328-440 | 113 |
| 4 | 441-586 | 146 |
| 5 | 587-735 | 149 |
| 6 | 736-885 | 150 |
| 7 | 886-955 | 70 |
| 8 | 956-1070 | 115 |
| 9 | 1071-1500 | 430 |
| 10 | 1501-1581 | 81 |
| 11 | 1582-1662 | 81 |
| 12 | 1663-1807 | 145 |
| 13 | 1808-1883 | 76 |
| 14 | 1884-1951 | 68 |
| 15 | 1952-2060 | 109 |
| 16 | 2061-2129 | 69 |
| 17 | 2130-2212 | 83 |
| 18 | 2213-2319 | 107 |
| 19 | 2320-2504 | 185 |
| 20 | 2505-2679 | 175 |
| 21 | 2680-2861 | 182 |
| 22 | 2862-2963 | 102 |
| 23 | 2964-3056 | 93 |
| 24 | 3057-3198 | 142 |
| 25 | 3199-3369 | 171 |
| 26 | 3370-3464 | 95 |
| 27 | 3465-3540 | 76 |
| 28 | 3541-3614 | 74 |
| 29 | 3615-3690 | 76 |
| 30 | 3691-3803 | 113 |
| 31 | 3804-3918 | 115 |
| 32 | 3919-4050 | 132 |
| 33 | 4051-4213 | 163 |
| 34 | 4214-4422 | 209 |
| 35 | 4423-5190 | 768 |