Linear regression on proportions.
D000225:Adenine; D003596:Cytosine; D004247:DNA; D003720:Densitometry; D006147:Guanine; D013223:Statistics as Topic; D013941:Thymine
D006147:Guanine; D003596:Cytosine; D004247:DNA; D000225:Adenine; D013941:Thymine