Fig. 1. Induction, transcription, and activation of VEGFA.
a, VEGFA gene transcription is induced by various extra- and intracellular signals, which ultimately target the regulatory elements within the VEGFA promoter region. b, alternative splicing of VEGFA transcript gives rise to VEGFA isoforms/polypeptides with disparate solubilities. c, proteolysis of matrix-bound VEGFA polypeptides releases bioactive fragments.