This is a notice of intent to award a sole-source contract for mass spectrometry services to analyze 14-3-3 protein binding partners in mouse heart tissue samples. The work involves performing mass spectrometry on 28 samples, analyzing the data, and providing a report, with a typical performance period of 5 weeks from April 13, 2026, to May 4, 2026. The government estimates the contract value will not exceed $7 million. Services will be performed for the National Institute on Aging in Baltimore, MD. The government has determined that only one responsible source, MSBioworks LLC, can meet this requirement due to proprietary equipment.