| Species | Tissue | Develeopmental stage | 5'EST | 3'EST | Total EST |
| Xenopus laevis | anterior endomesoderm | late gastrula | 33,564 | 32,770 | 66,334 |
| Xenopus laevis | anterior neuroectoderm | late gastrula | 38,083 | 31,832 | 69,915 |
| Xenopus laevis | Keller explants | mixture of equivalent stages (early gastrula to mid neurula) | 35,610 | 33,573 | 69,183 |
| Xenopus laevis | whole embryo | stage 25 | 18,913 | 16,635 | 35,548 |
| Xenopus laevis | whole embryo | stage 15 | 16,465 | 12,255 | 28,720 |
| Xenopus laevis | whole embryo | stage 10.5 | 20,848 | 19,628 | 40,476 |
| Xenopus tropicalis | embryo | gastrula | 29,817 | 30,076 | 59,893 |