- Meso1, a basic-helix-loop-helix protein involved in mammalian presomitic mesoderm development. Blanar, M.A., Crossley, P.H., Peters, K.G., Steingrímsson, E., Copeland, N.G., Jenkins, N.A., Martin, G.R., Rutter, W.J. Proc. Natl. Acad. Sci. U.S.A. (1995)