GOBO::Gene

  printf '%s "%s" %s %s', $n->id, $n->label, $n->type, $n->taxon;

An GOBO::Node that corresponds to a specific SO:gene

In GO, genes are the subject of GOBO::Annotation statements

This should really be in bioperl.

Modeled as nodes as they can be elements in a graph. cf Chado