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The protein complex crystallographic beamline BL19U1 at the Shanghai Synchrotron Radiation Facility is one of the five beamlines dedicated to protein sciences operated by National Facility for Protein Science (Shanghai, China). The beamline, which features a small-gap in-vacuum undulator, has been officially open to users since March 2015. This beamline delivers X-ray in the energy range 7–15 keV...