[lemma=study] [lemma=have] [tag=VBN] [□] □
[lemma=study] [lemma=have] [tag=VBN] [□=□] □
[lemma=study] [lemma=have] [tag=VBN] [□ | □] □
Studies have shown that corn prices in areas near an ethanol plant tend to be five to 10 cents per bushel higher than in other areas . Studies have shown that laughter boosts the immune system in variety of ways . Data from one epidemiologic study have suggested that vaccination may provide protection for at least 9 years after receipt of the initial dose ( 44 ) . Our studies have demonstrated that PKCd is an early and essential regulator of apoptosis in salivary epithelial cells and that PKCd may function upstream of the mitochondria as an integrator of diverse death signals . Studies have shown that corn prices in markets near ethanol plants will increase between five and eight cents per bushel . Numerous studies have shown that influenza vaccination works to protect the elderly from serious illness and hospitalizations as a result of influenza-like illness .