2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88313We prove the global asymptotic stability of a well-known delayed negative-feedback model of testosterone dynamics, which has been proposed as a model of oscillatory behavior. We establish stability (and hence the impossibility of oscillations) even in the presence of delays of arbitrary length.10 pages, no figures. Submitted to the Journal of Theoretical BiologyMolecular Networkstext