Figure 1
From: Transcription of the genome: don't read it all at once
Proteomic analysis of nucleolar proteins. The availability of gene sequence data and advances in techniques of mass spectroscopy now allow large-scale protein identification. The sample shown is a two-dimensional gel (pH 4-7) of purified HeLa-cell nucleolar extract. Figure courtesy of A. Fox, C. Lyon, J. Anderson, M. Mann and A. Lamond.