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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Biochim Biophys Acta. 2009 Nov 6;1804(8):1584–1590. doi: 10.1016/j.bbapap.2009.10.024

Fig. 4.

Fig. 4

A schematic model of the interplay between tissues that provide “the aging clock” function and tissues that are frailty points in the NAD World. This interplay plays a critical role in the maintenance of systemic robustness through the entire body. The NAD World functions to orchestrate physiological responses to nutritional and environmental inputs and connects physiological rhythmicity, metabolism, and aging.