Research revenue for the three and six months ended December 31, 2010 was $23,000 and $130,000 compared to $0 and $60,000 in the same periods in 2009. Research revenue in all periods reflects charges under services agreements related to the characterization of protein-protein interactions. Due to more limited demand and general market conditions for such services, the Company does not expect growth in its research revenue.
Research and development expenses for the three and six months ended December 31, 2010 were $5.0 million and $10.7 million compared to $8.2 million and $14.1 million in the same periods last year. The respective 39% and 24% decreases were primarily due to lower external drug development costs resulting from the discontinuation of HIV drug candidate MPC-4326, the completion of patient enrollment in other clinical trials, and decreased preclinical development costs resulting from reductions in headcount and laboratory supplies.
Myrexis expects research and development expenses to fluctuate over the next several years as it conducts additional clinical trials to support the potential commercialization of drug candidates.
General and administrative expenses for the three and six months ended December 31, 2010 were $4.2 million and $8.8 million compared to $6.9 million and $12.2 million for the same periods in 2009. These 39% and 28% decreases in general and administrative expenses were due primarily to a reduction in headcount; and the inclusion of expenses associated with an acquisition proposal and higher litigation related expenses, in the prior year periods. These decreases were offset, in part, by increased facilities costs.Other income of $1.4 million and $1.5 million for the three and six months ended December 31, 2010 compared to $0.4 million and $0.8 million for the same periods in 2009, respectively, reflects a one-time $1.2 million grant received in November 2010 as a part of the qualifying therapeutic discovery project under Section 48D of the Internal Revenue Code. This increase was offset, in part, by a reduction in interest income earned on the Company's marketable investment securities, during the current periods, due to a lower invested balance of marketable securities.