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Northern Rio Grande National Heritage Area
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| |  | | Did You Know? As the green chlorophyll pigment in an aging leaf disintegrates and disappears, other pigments or colors already within the leaf appear. For example, shades of yellow and orange, are caused by the presence of xanthophyll and carotin. more... | | |
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Last Updated: April 23, 2009 at 00:57 MST |