ATF6α/β-mediated adjustment of ER chaperone levels is essential for development of the notochord in medaka fish

The endoplasmic reticulum (ER) membrane-bound transcription factors ATF6α and ATF6β mediate adjustment of chaperone levels to increased demands in the ER, which is essential for development of the notochord; the latter synthesizes and secretes large amounts of extracellular matrix proteins to serve as the body axis before formation of the vertebra.

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