Rituximab (Rituxan and MabThera) is a drug used to treat rheumatoid arthritis that has not improved with other types of medications, as well as certain forms of vasculitis.
As retirement accounts, the Roth IRA and the TSP Roth have annual investment limits. The TSP Roth has a significantly higher investment limit than the Roth IRA. Investors will be able to put $16,500 in a TSP Roth, whereas a maximum of $5,000 can be put into a Roth IRA in 2011. A TSP Roth has a higher catch-up provision as well.
Note that in the eyes of the IRS these are two completely separate accounts with different contribution limits. You are allowed to contribute $18,000 to your TSP and $5500 to your IRA in 2015. The two different tax treatments for retirement accounts (IRA or 401k/TSP) are Traditional and Roth. Traditional contributions to your retirement accounts result in your taxes now being lowered, but you have to pay tax when you withdraw the money after age 59.5.