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Comment :

Type  MGI:General Description  phenotype occurs randomly on either left or right limb, although occasionally both forelimbs are affected malformation is most prominent distally and partly distorts olecranon fossa; elbow is locked in simultaneous pronation-extension along with 180 degree twist of paw making limb insufficient for support biceps brachii of forelimb has misplaced insertion; in controls, muscle inserts at proximal part of radius, but in mutants, distal tendon of biceps brachii is curled around radius and inserts dorsally at most distal part of radius abnormal muscle insertion results in limited elbow motion and permanent pronation of forelimb