Journal Article serial femtosecond crystallography protein crystallography FEL Research Support, Non-U.S. Gov't SFX Ferredoxins Metalloproteins Research Support, U.S. Gov't, Non-P.H.S. X-ray X-ray FEL X-ray free-electron laser coherent diffracted imaging droplet generation free-electron laser injection metalloprotein microfluidic devices multiplexing nanocrystallography radiation damage room-temperature crystallography serial crystallography single molecule imaging time-resolved crystallography