| alignment | - Alignment aggregator |
| clone | - Clone aggregator |
| coding | - The Coding Region Aggregator |
| match | - Match aggregator |
| none | - No aggregation |
| processed_transcript | - Sequence Ontology Transcript |
| transcript | - Transcript aggregator |
| ucsc_acembly | - UCSC acembly aggregator |
| ucsc_ensgene | - UCSC ensGene aggregator |
| ucsc_genscan | - UCSC genscan aggregator |
| ucsc_refgene | - UCSC refGene aggregator |
| ucsc_sanger22 | - UCSC sanger22 aggregator |
| ucsc_sanger22pseudo | - UCSC sanger22pseudo aggregator |
| ucsc_softberry | - UCSC softberry aggregator |
| ucsc_twinscan | - UCSC twinscan aggregator |
| ucsc_unigene | - UCSC UniGene aggregator |