Toward an objective classification of cells in the immune system.

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Abstract
The relative abundance of individual proteins shared among clones of lymphocytes provides a meaningful basis for cellular classification. Twelve clones of T cells (obtained by limiting dilution) were analyzed by two-dimensional gel electrophoresis for polypeptide content and then evaluated by the computational technique known as principal component analysis. As a result, relatedness of the clones was established and expressed in terms of taxonomic distances. The data show that a comprehensive and objective classification of the cells involved in the immune system can be approached.