title: Causality in biology has to answer 2 main questions--which and how: letter to the editor.
authors: Sabino
authors: S
authors: Padilla
authors: Gorka
authors: G
authors: Orive
authors: Mikel
authors: M
authors: Sánchez
authors: Eduardo
authors: E
authors: Anitua
authors: Amy S
authors: AS
authors: Wasterlain
authors: Jason L
authors: JL
authors: Dragoo
mesh_terms: D015415:Biomarkers / Q000097:blood*; D004300:Doping in Sports; D005260:Female; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000097:blood*; D008297:Male; D053657:Platelet-Rich Plasma
chemical_list: D015415:Biomarkers; D036341:Intercellular Signaling Peptides and Proteins