Research and development expenses were $0.2 million in the three months ended June 30, 2023 compared to $1.2 million in the prior year period, a decrease of $1.0 million, or 85%. The lower research and development expenses was primarily due to a decrease of $0.6 million associated with our research programs related to the suspension of our activities, a $0.2 million decrease in compensation costs due to lower headcount in the current year period and a $0.1 million decrease in rent expense as we reduced the amount of office space leased.
General and administrative expenses were $4.3 million in the three months ended June 30, 2023 compared to $1.6 million in the prior year period, an increase of $2.7 million, or 173%. The increase in general and administrative expenses was due to a $1.7 million increase in professional fees primarily due to costs related to the Merger and a $1.2 million compensation charge incurred in the current year period related to the retention of our key executives. These increases were partially offset by lower compensation costs and directors fees of $0.2 million primarily due to the decrease in stock-based compensation of $0.1 million.
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