HOX Gene Expression in the Embryo, Fetus, Neonate, and Adult
| Day . | Organ/Tissue . | HOX B5 . | HOX B6 . | HOX B7 . | HOX B8 . |
|---|---|---|---|---|---|
| 6.5 | Whole embryo | + | + | + | − |
| 7.5 | Whole embryo | + | + | + | (+) |
| 8.5 | Whole embryo | + | + | + | + |
| 9.5 | Whole embryo | + | + | + | + |
| 10.5 | Whole embryo | + | + | + | + |
| 11.5 | Whole embryo | + | + | + | + |
| 12.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 13.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 14.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 15.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 16.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 17.5 | Fetal liver | + | − | + | − |
| Fetal spleen | + | + | + | − | |
| Fetal kidney | + | + | + | − | |
| Fetal heart | − | + | + | − | |
| Fetal lung | − | + | + | − | |
| 18.5 | Fetal liver | + | − | + | − |
| Fetal spleen | + | + | + | − | |
| Fetal kidney | + | + | + | − | |
| Fetal heart | − | − | + | − | |
| Fetal lung | − | − | + | − | |
| 19.5 | Fetal liver | + | + | + | − |
| Fetal spleen | + | + | + | − | |
| Fetal kidney | + | + | + | − | |
| Fetal heart | − | − | + | − | |
| Fetal lung | − | − | + | − | |
| 0.5-day neonate | Liver | + | + | + | − |
| Spleen | + | + | + | − | |
| Kidney | + | + | + | − | |
| Heart | + | + | + | − | |
| Lung | + | + | + | − | |
| Adult | Liver | + | + | + | − |
| Spleen | + | + | + | − | |
| Kidney | + | + | + | − | |
| Heart | ND | − | + | − | |
| Lung | ND | − | + | − |
| Day . | Organ/Tissue . | HOX B5 . | HOX B6 . | HOX B7 . | HOX B8 . |
|---|---|---|---|---|---|
| 6.5 | Whole embryo | + | + | + | − |
| 7.5 | Whole embryo | + | + | + | (+) |
| 8.5 | Whole embryo | + | + | + | + |
| 9.5 | Whole embryo | + | + | + | + |
| 10.5 | Whole embryo | + | + | + | + |
| 11.5 | Whole embryo | + | + | + | + |
| 12.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 13.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 14.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 15.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 16.5 | Fetal liver/embryo | +/+ | +/+ | +/+ | − |
| 17.5 | Fetal liver | + | − | + | − |
| Fetal spleen | + | + | + | − | |
| Fetal kidney | + | + | + | − | |
| Fetal heart | − | + | + | − | |
| Fetal lung | − | + | + | − | |
| 18.5 | Fetal liver | + | − | + | − |
| Fetal spleen | + | + | + | − | |
| Fetal kidney | + | + | + | − | |
| Fetal heart | − | − | + | − | |
| Fetal lung | − | − | + | − | |
| 19.5 | Fetal liver | + | + | + | − |
| Fetal spleen | + | + | + | − | |
| Fetal kidney | + | + | + | − | |
| Fetal heart | − | − | + | − | |
| Fetal lung | − | − | + | − | |
| 0.5-day neonate | Liver | + | + | + | − |
| Spleen | + | + | + | − | |
| Kidney | + | + | + | − | |
| Heart | + | + | + | − | |
| Lung | + | + | + | − | |
| Adult | Liver | + | + | + | − |
| Spleen | + | + | + | − | |
| Kidney | + | + | + | − | |
| Heart | ND | − | + | − | |
| Lung | ND | − | + | − |
Abbreviation: ND, not done.