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"Green, yellow and orange colors are always present in leaves, but chlorophyll - the green pigment responsible for photosynthesis - is so dominant during most of the year that it masks out the other colors," says Igor Lacan, UC Cooperative Extension urban forestry advisor.

“Green, yellow and orange colors are always present in leaves, but chlorophyll – the green pigment responsible for photosynthesis – is so dominant during most of the year that it masks out the other colors,” says Igor Lacan, UC Cooperative Extension urban forestry advisor.

“Green, yellow and orange colors are always present in leaves, but chlorophyll – the green pigment responsible for photosynthesis – is so dominant during most of the year that it masks out the other colors,” says Igor Lacan, UC Cooperative Extension urban forestry advisor.

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