Teacher:Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
Teacher: Now, understand the problem? Solve this instance: Abstract: Tissues acquired at autopsy from four patients with MS and biopsies from one patient with a probable diagnosis of MS were probed for the presence of OC43 RNA. This human coronavirus was not detected.
Student:
Animal