we conclude that there are probably two major classes of antenna carotenochlorophyll-proteins in purple bacteria containing bacteriochlorophyll a : a b890 complex which has one carotenoid and two bacteriochlorophyll molecules in the minimal unit ( probable molecular weight around 20,000 ) , and a b800 + b850 complex which has one carotenoid and three bacteriochlorophyll molecules in a similar-sized minimal unit .
C0004638
bacteriochlorophyll
C0600166
bacteriochlorophyll