| http://www.w3.org/ns/prov#value | - A biological threshold is a transition point between the highest dose that will not elicit a specified biological effect, and the lowest dose that will (see Appendix to Julien et al. 2009 for further discussion).3 LRAT also increases in some extrahepatic tissues, such as the lungs, when vitamin A or retinoic acid are above usual levels (Ross et al., 2006).
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