Science Citation Index covers 164 scientific disciplines including: Agriculture, Neuroscience Astronomy, Biochemistry, Biology, Biotechnology, Chemistry, Computer Science, Oncology, Materials Science, Mathematics, Medicine, Pediatrics, Pharmacology, Physics, Plant Sciences, Psychiatry, Surgery, Veterinary Science, and Zoology. Cited reference searching, a search option unique to ISI-Thompson Scientific databases, searches the reference lists of indexed journal articles.