STELLA-positive subregions of the primitive streak contribute to posterior tissues of the mouse gastrula

► STELLA protein was systematically localized to the mouse gastrula. ► STELLA localized to multiple tissues in the posterior region. ► STELLA was not confined to the established primordial germ cell trajectory. ► STELLA-positive tissues contribute to multiple tissues of the posterior region. ► STELLA may be part of a progenitor pool that is deployed to various posterior tissues.