TY  - RPRT
TI  - Positional signalling along hydra.
AU  - L Wolpert
AU  - M R Clarke
AU  - A Hornbruch
PY  - 1972
DO  - 10.1038/newbio239101a0
UR  - https://pubmed.ncbi.nlm.nih.gov/4507514/
ID  - 4507514
ER  -