Greenbaum et al 1 Analysis of mRNA expression and protein abundance data:  An approach for the comparison of the enrichment of features in the cellular population of proteins and transcripts Dov Greenbaum 3, * , Ronald Jansen 1, * , & Mark Gerstein 1, 2, † Department of Molecular Biophysics & Biochemistry1 Computer Science2 and Genetics3 266 Whitney Avenue, Yale University PO Box 208114, New Haven, CT 06520 (203) 432-6105, FAX (360) 838-7861 Dov.Greenbaum@yale.edu Ronald.Jansen@yale.edu Mark.Gerstein@yale.edu * These authors contributed equally to this work. To whom correspondence should be addressed