TY  - GEN
AU  - Slack,J M
TI  - Embryology: we have a morphogen!
SN  - 0028-0836
PY  - 1987///0727
KW  - Animals
KW  - Embryonic and Fetal Development
KW  - drug effects
KW  - Morphogenesis
KW  - Tretinoin
KW  - pharmacology
N1  - Publication Type: News
UR  - https://doi.org/10.1038/327553a0
ER  -