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Teratocarcinoma-derived growth factor 1 (TDGF1), also known as CRIPTO, is expressed both in ES cells and during the early phases of embryo development. During development, CRIPTO is thought to play a role in the determination of the epiblastic cells that subsequently give rise to the mesoderm. In adults, it is reactivated in a wide range of epithelial cancers.
CRIPTO-1 antibodies are useful tools for studying embryonic development and certian cancers.