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Bonafè et al. (2003) "Polymorphic variants of insulin-like growth factor I (IGF-I) receptor and phosphoinositide 3-kinase genes affect IGF-I plasma levels and human longevity: cues for an evolutionarily conserved mechanism of life span control." J. Clin. Endocrinol. Metab. 88(7):3299-3304 (PubMed)