With 3 type I receptors and 3 type II receptors, as many as 9 receptor complexes can be activated by BMP2. Figure credit made with BioRender by Nancy R. Gough, BioSerendipity.
Read more: N. R. Gough, TGF-β and Wnt Signaling Challenge the Concept of ‘a’ Pathway. BioSerendipity (12 March 2018) https://www.bioserendipity.com/tgf-%CE%B2-and-wnt-signaling-challenge-the-concept-of-a-pathway/