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The limb bud is a system of paradigmatic value to analyze vertebrate organogenesis. One major question is when and how the chondrogenic progenitors of the limb skeleton are determined. Recent studies suggest that digit identities are only fixed during advanced autopod development by BMP signal transduction. Here, I propose an in-depth analysis of the underlying signaling systems using mouse limb ...

"The SHH morphogenetic pathway exerts multiple functions during embryonic and adult life. It is involved in various cellular contexts to provide positional information, but also controls cell survival, proliferation and differentiation. Aberrant activation of the pathway has also been linked to tumour formation and growth. The SHH signal is integrated by receiving cells via the GLI transcription f ...