Sunlight ultraviolet and bacterial DNA base ratios.
D005075:Biological Evolution; D003596:Cytosine / Q000032:analysis; D004269:DNA, Bacterial / Q000032:analysis / Q000528:radiation effects*; D006147:Guanine / Q000032:analysis; D013472:Sunlight; D014466:Ultraviolet Rays
D004269:DNA, Bacterial; D006147:Guanine; D003596:Cytosine