If gene identifiers match PLAZA 3.0 dicots or EVEX, one of those platforms can be selected and links
generated automatically. To add custom XRefs use a definitions file matching the format below.
Example input: four columns are required (tab delimited), the sequence identifier, the name in the referenced platform, the name of the platform and the
url.
gene01 gene01 external_website http://url.com/gene01
gene02 gene02 external_website http://url.com/gene02
gene03 gene03 external_website http://url.com/gene03
...