Virion-associated influenza virus proteins identified by mass spectrometry.

aGel slices were numbered consecutively from the top to the bottom of an 8–16% gel. bFrom a higher percentage gel. cObserved peptides include all peptides that differ either by sequence, modification or charge. dValues represent the range when the protein was found in multiple gel slices. eA Mascot score ≥50 and a Protein prophet score ≥0.95 are equivalent (p<0.05). fSequence coverage is based on peptides with unique sequence.