---
layout: rule
id: GORULE:0000037
title: "IBA annotations should ONLY be assigned_by GO_Central and have GO_REF:0000033 as a reference"
type: filter
fail_mode: hard
status: implemented
contact: "go-quality@lists.stanford.edu"
implementations:
  - language: python
    source: https://github.com/biolink/ontobio/blob/master/ontobio/io/qc.py
---

For annotations with the IBA evidence code, (1) the 'assigned_by' field (GAF column 15; GPAD column 10) must be GO_Central and (2) the 'reference' field (GAF column 6; GPAD column 5) must be GO_REF:0000033.

Implementation: the GO Central pipeline filters out IBAs from any submission source that is not in the PAINT submission source, i.e. one registered in [paint.yaml](https://github.com/geneontology/go-site/blob/master/metadata/datasets/paint.yaml). IBAs from PAINT are injected in to the final release files as part of the release process.

See also GORULE:0000026.