The diagram represents the confusion that can arise when a single pathway actually represents many different pathways. Get expert advice about how to present this complexity in scientific writing in the post
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/