T2 Biosystems (Cambridge, MA) a development-stage molecular and immunodiagnostic company focused on a nanotechnology and miniaturized magnetic resonance designed to optimize sample prep, closed a $12M Series C financing. Participants include Physic Ventures, Arcus Ventures, RA Capital, Camros Capital, WS Investments, Flagship Ventures, Polaris Venture Partners, Flybridge Capital Partners and Partners Healthcare.