2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182409We show that enhanced extra mixing in low-mass red giants can result in a fluorine abundance that is correlated with abundance variations of other elements participating in H burning, such as C, N, O and Na. This finding is used to explain the fluorine abundance variations recently found in bright red giants of the globular cluster M4.17 pages, 6 figures, submitted to ApJAstrophysicstext