Each viral service request will also include virus associated DNA, which is a sample of the purified DNA from the original plasmid that was used to make the virus. In order for Addgene to provide viral services to you, we must ensure that you have the right to use the original plasmid. Distribution of the original plasmid is important because it is the actual material being referenced in the Material Transfer Agreement (MTA) and its inclusion is what gives you permission to use the plasmid.
For each unique plasmid or library, only a single order of virus associated DNA is required when requesting a viral preparation. In other words, if you request two or more viral preparations of the same plasmid or pooled library, only one order of virus associated DNA would be required.