Sträng and Flock also participated in a medical experiment conducted by Uppsala University Hospital under the supervision of researcher Stefan Branth and medical student Fredrik Wallin.
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Three scientists working at Uppsala University Hospital, Leif Wide, Rolf Axén and Jerker Porath, then presented their ideas to use Pharmacia's separation medium Sephadex as the solid phase in immunodiagnostics tests and proposed a collaboration with the company for the commercial development.