1. Agius, E., Oelgeschlager, M., Wessely, O., Kemp, C. and De Robertis, E. M. (2000). Endodermal Nodal-related signals and mesoderm induction in Xenopus. Development127,1173-1183.
2. Birsoy, B., Berg, L., Williams, P. H., Smith, J. C., Wylie, C. C., Christian, J. L. and Heasman, J. (2005). XPACE4 is a localized pro-protein convertase required for mesoderm induction and the cleavage of specific TGFβ proteins in Xenopus development. Development132,591-602.
3. Bouwmeester, T., Kim, S., Sasai, Y., Lu, B. and De Robertis, E. M. (1996). Cerberus is a head-inducing secreted factor expressed in the anterior endoderm of Spemann's organizer. Nature382,595-601.
4. Chen, X., Rubock, M. J. and Whitman, M. (1996). A transcriptional partner for MAD proteins in TGF-beta signalling. Nature383,691-696.
5. Cui, Y., Hackenmiller, R., Berg, L., Jean, F., Nakayama, T.,Thomas, G. and Christian, J. L. (2001). The activity and signaling range of mature BMP-4 is regulated by sequential cleavage at two sites within the prodomain of the precursor. Genes Dev.15,2797-2802.