Vaongorori paYunivhesiti yeFlorida kuGainesville vakawana puroteni inonzi nerve growth factor (NGF) mumuromo membe. Maronda akasvibiswa neNGF akapora nekukurumidza zvakapetwa kaviri pane maronda asina kurapwa uye asina kusvibiswa; nokudaro, muromo unogona kubatsira kupora maronda mune mamwe marudzi. NGF haina kuwanikwa mumuromo wemunhu; zvisinei, vaongorori vanowana muromo wemunhu une mishonga inorwisa mabhakitiriya yakadai se secretory agents IgA, lactoferrin, lysozyme uye peroxidase. Hazvina kuratidzwa kuti kusveta kwevanhu kunovaparadza, asi kunobatsira kuchenesa maronda makuru nekubvisa tsvina yakadai semuviri uye kunogona kubatsira kuabvisa zvakananga nekusveta maronda.
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