| http://www.w3.org/ns/prov#value | - ???Burls can be caused by stress or various organisms such as bacteria, insects and nematodes [worms], and they are not all the same,??? said Valerie Williamson, a professor of nematology at UC Davis, and recently named fellow of the American Association for the Advancement of Science. ???They are not usually directly harmful, but the associated organisms can cause disease.???
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