MeSH headings : Animals; Drosophila melanogaster / metabolism; Evolution, Molecular; Gene Expression Regulation, Developmental; Insect Proteins / chemistry; Insect Proteins / genetics; Insect Proteins / metabolism; Orphan Nuclear Receptors / chemistry; Orphan Nuclear Receptors / genetics; Orphan Nuclear Receptors / metabolism; Tribolium / embryology; Tribolium / genetics; Tribolium / metabolism

TL;DR: It is proposed that the dependence of Dm‐Ftz‐F1 on interaction with the homeodomain protein Ftz which is expressed in stripes in Drosophila, loosened constraints on DM‐ftz‐f1 expression, allowing for ubiquitous expression of this pair‐rule gene in Dosophila. (via Semantic Scholar)