One subject term, critical expression, key phrase, abbreviation, indexing word, etc. that is associated with the whole document and can be used for identification and indexing purposes.
Conversion Note: Keywords are not allowed to nest. There are a few journal DTDs in which keyword nesting is used to simulate a two-part list. Such a keyword list should be tagged as a Definition List instead.
Any combination of:
<article> <front> ... <abstract>... </abstract> <kwd-group> <kwd>DNA analysis</kwd> <kwd>gene expression</kwd> <kwd>parallel cloning</kwd> <kwd>fluid microarray</kwd> </kwd-group> </article-meta> </front> ...</article>