The barcode algorithm is designed to estimate which genes are expressed and which are unexpressed in a given microarray hybridization. The output of our algorithm is a vector of ones and zeros denoting which genes are estimated to be expressed (ones) and unexpressed (zeros). We call this a gene expression barcode. McCall et al., "The Gene Expression Barocde: leveraging public data repositories to begin cataloging the human and murine transcriptomes" Nucleic Acids Research. 2011 Jan;39(suppl 1):D1011-D1015