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.
If all your retirement income is from a 401k/TSP, let's say, don't forget that the amount of tax you'd pay on that first $1000 of retirement income is zero! So there's not an advantage initially. But that -last- dollar you get from TSP would be taxed at a much higher rate, so it makes the Roth the better deal often.