Task: Named Entity Recognition
Input (English):  In a 1 . 5 ml microcentrifuge tube , plasmid ( 1 microg / microl ) and siRNA were mixed with growth medium without fetal calf serum ( FCS ) , 0 . 5 microl 1 . 5 M sucrose and 3 microl X - tremeGENE per microgram nucleic acid to a final volume of 22 . 5 microl .
Output (English): serum