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How the Horned Lizard Got Its Horns
Science, 2004Many descriptions of evolutionary adaptations are criticized as “just-so stories” ([ 1 ][1]) that are based more on intuition than on direct tests of adaptive hypotheses. The elaborate crowns of horns possessed by many species of horned lizards (genus Phrynosoma ) are classic examples ...
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Trichilemmal horn: cutaneous horn showing trichilemmal keratinization
British Journal of Dermatology, 1979A unique and distinctive clinicopathological entity occurred in nineteen patients who ranged in age from 16 to 72 (median 50) years. Clinically, these were solitary cutaneous horns. Nine were on the limbs, four on the back, two on the face, three on the scalp, and in one the site was not known; the median duration was 2 years. Histologically, there was
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