MM Babu, NM Luscombe, L Aravind, M Gerstein, SA Teichmann (2004) Curr Opin Struct Biol 14: 283-91. Structure and evolution of transcriptional regulatory networks 15193307 trans-reg http://papers.gersteinlab.org/e-print/trans-reg/reprint.pdf interactions,regnet,2004-summary