The Append Gene Annotation feature is used to append additional gene annotation
from an MeV style annotation (.ann, or .dat) file. The annotation file format is described
in detail in the File Format Appendix of the MeV manual. This dialog presents selection lists
for two keys used to map annotation to genes. The first key should be a primary identifier
of genes in the loaded data. This could be UID or some current annotation field.
The other key represents a column from the annotation file to be used as a key identifier.
These two keys are used to map or associate annotation from the file to the proper gene in the loaded
data set. It is not imperative that all loaded genes be present in the annoation file and it
is possible that the annotation file could have many more indices than those found in the data set.
Genes that are not found in the input annotation file will have empty annotation for the imported annotation fields.