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Obst-A organizes the aECM at the apical cell surface. Schematic model illustrates Obst-A in the cuticle. Our data provide evidence that Obst-A arranges chitin matrix maturation and protection at the apical cell surface. We propose that Obst-A controls chitin scaffold formation. Obst-A acts in a common pathway with the deacetylation enzymes Serp and Verm and with the chitin protector Knk to mature, stabilize, and protect the aECM within the cuticle.
