Assertion: saliva | /r/MadeOf | lysophosphatidic acid
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Source sentences:
text: Saliva contains growth factors such as epidermal growth factor, VEGF, TGF-β1, leptin, IGF-I, lysophosphatidic acid, hyaluronan and NGF, which all promote healing, although levels of EGF and NGF in humans are much lower than those in rats.