Field that utilizes protein sequences, expression and structure to determine how proteins relate, interact and function in an organism; includes characterizing and cataloguing proteins and protein libraries, comparing variations in protein expression levels under different conditions, studying protein interactions and functional roles; techniques are performed in an automated, large scale manner; may also involve bioinformatic analysis and storage of data.

The global analysis of cellular proteins. Proteomics uses a combination of sophisticated techniques including two-dimensional (2D) gel electrophoresis, image analysis, mass spectrometry, amino acid sequencing, and bio-informatics to resolve comprehensively, to quantify, and to characterize proteins. The application of proteomics provides major opportunities to elucidate disease mechanisms and to identify new diagnostic markers and therapeutic targets.

The study of the structure and function of proteins, including the way they work and interact with each other inside cells.

The systematic study of the complete complement of proteins (PROTEOME) of organisms.