Mural cells protect the adult brain from hemorrhage but do not control the blood-brain barrier in developing zebrafish. - Baltaci OF; Usseglio Gaudi A; Dudczig S; Wang W; Paterson S; Rondon-Galeano MC; Lim YW; Rae J; Lagendijk A; Parton RG; Farley A; Hogan BM (ELife, 2026)