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Table 1 Number of protein groups and distinct peptides identified in the proteomics data.

From: Initial characterization of the human central proteome

Cell line Protein groups With isoformsa Specific isoformsb Distinct peptides Germ layer
HaCat 2031 2673 13 29040 Ectoderm
HEK293 4154 5412 64 71571 Mesoderm
HeLa 2379 3075 31 31609 Mesoderm
HepG2 2494 3298 24 30194 Endoderm
K562 3141 4078 37 48202 Mesoderm
Namalwa 2686 3527 29 37512 Mesoderm
U937 2073 2720 25 28786 Mesoderm
  1. (a) Number of protein group reporters in case alternative splice variants are counted as well because they have all the peptides of the protein group, although they do not necessarily have a specific peptide detected. (b) Isoforms supported by a specific peptide.