---
layout: rule
id: GORULE:0000030
title: "Only valid GO_REFs are allowed"
type: filter
fail_mode: hard
status: implemented
contact: "go-quality@lists.stanford.edu"
---
GO_REFs are here: https://github.com/geneontology/go-site/tree/master/metadata/gorefs.yaml
- References for which is_obsolete: `true` are not allowed as a reference (GAF column 6; GPAD column 5), and annotations using those as a reference are filtered by the pipeline and reported as errors.
- All GO_REFs should be valid according to the gorefs.yaml file.