TY  - RPRT
TI  - Activin has direct long-range signalling activity and can form a concentration gradient by diffusion.
AU  - N McDowell
AU  - A M Zorn
AU  - D J Crease
AU  - J B Gurdon
PY  - 1997
DO  - 10.1016/s0960-9822(06)00294-6
UR  - https://pubmed.ncbi.nlm.nih.gov/9285724/
ID  - 9285724
ER  -