The EMA has published a checklist for marketing authorisation holders to use prior to notification of Type IA or Type IAIN variation:
http://www.ema.europa.eu/docs/en_GB/document_library/Other/2014/12/WC500178947.pdf
As of February 2021, Cyton and Triveritas became knoell, creating one animal health team based in the US, EU, China, and the UK.
Cyton.com will no longer be maintained, but you can continue to follow us at knoell.com