What are the most common alterations to the traditional 2/20 compensation model seen in healthcare funds?

Thanks Mike. I was referring to a section in the article titled Venture Fund Economics that discusses how 2/20 model alterations are negotiated by fund managers and investors to "better align with specific strategies, risk and market conditions" including budget-based management fees, preferred return, deal-by-deal carry etc. Any insight you can provide on common alterations like these seen in healthcare funds would be greatly appreciated. 

You should avoid budget-based management fees, preferred return, deal-by-deal carry etc. All this stuff brings in un-necessary and excessive complexity and cost and are not beneficial, especially for emerging managers. Our recommendation is to do a clean  2&20 fund with no special terms.