. "Catalysis of the reactions: chlorophyllide a + O2 + NADPH + H+ = 7-hydroxychlorophyllide a + H2O + NADP+; and 7-hydroxychlorophyllide a + O2 + NADPH + H+ = chlorophyllide b + 2 H2O + NADP+." . . "chlorophyllide a oxygenase [overall] activity" . "CAO activity" . "chlorophyll a oxygenation activity" . "chlorophyll b synthesis activity" . "chlorophyll-b synthesis activity" . "chlorophyllide a:oxygen 7-oxidoreduction activity" . "chlorophyllide-a oxygenation activity" . . . . . .