Activates dormant horn-growth genetic pathways — remnants of humanity's distant evolutionary ancestry — and combines them with bovid and cervid keratin sequences to produce controlled cranial horn growth. Results range from small, subtle ridges above the temples to full curved ram-style horns or branching antler formations. The modification is structural: the horns are real bone and keratin rooted in the skull. They grow slowly, can be shaped during growth by wearing molds, and must be trimmed if the user doesn't want them to keep growing. Helix Biosystems offers a seasonal-shed variant based on deer genetics where the horns drop off yearly and regrow, allowing the user to change styles. Horn culture in GLMZ is rich and varied — there are salons that specialize in horn shaping, lacquering, and decoration. In the Shelf, horns signal community identity; in the corporate towers, they signal controlled rebellion.