| http://www.w3.org/ns/prov#value | - These agents can be natural orartificial chemicals, including growth factors such as nerve growth factor, hormones such as melatonin, chemical signaling agents such as cytokines, and toxic agents such as tamoxifen, pertussis toxin, and chloral hydrate, as well as chemotherapeuticcompounds such as cytosine arabinoside.For determining the effects of chemical
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