This is a C. elegans embryo undergoing morphogenesis, stained for polarized markers of epithelia. The white staining is against a junctional protein called DLG-1/Discs Large and marks adherens junctions of the foregut, midgut, and hindgut. The red stain is against LAM-3/Laminin and marks the basement membrane. DAPI (blue) marks nuclei. Check out more of the Mango Lab's publications here.