  We present evidence of ultrafast random lasing from the fluorescent protein
DsRed2 embedded in a random one-dimensional cavity. Lasing is achieved when a
purified protein solution, placed inside a layered random medium, is optically
excited with a femtosecond pump pulse in the direction perpendicular to the
plane of random layers. We demonstrate that pumping with ultrashort pulses
resulted in a lasing threshold two orders of magnitude lower than that found
for nanosecond excitation.
