contents in plasma is very large, it is difficult to detect proteins that tend to be scarce when compared to abundant proteins. There is an analytical limit that may possibly be a barrier for the detections of proteins with ultra low concentrations. Databases such as neXtprot and UniProt are central resources for human proteomic data. See also Metabolome Cytome Bioinformatics List of omics topics in biology Plant Proteome Database Transcriptome Interactome Human Proteome Project BioPlex Human Protein Atlas References External links PIR database UniProt database Proteomics