@misc{indiciae7a391812dbef,
  title = {Activin has direct long-range signalling activity and can form a concentration gradient by diffusion.},
  author = {N McDowell and A M Zorn and D J Crease and J B Gurdon},
  year = {1997},
  doi = {10.1016/s0960-9822(06)00294-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/9285724/},
  note = {Source identifier: 9285724}
}