Modifies a noun

• variation: Recent studies of isozyme variation have revealed three areas of diversity.

• study: Phenological and isozyme studies have been used to compare levels of genetic diversity and mating patterns within seed orchards and living fence lines.

• marker: Future work will concentrate on analyzing the genetic variation in the sampled provenances using isozyme markers.

• method: This is being carried out using morphometric and isozyme methods.