Gene expression in notochord and nuclei pulposi: a study of gene families across the chordate phylum oleh Rahul Raghavan, Ugo Coppola, Yushi Wu, Chibuike Ihewulezi, Lenny J. Negrón-Piñeiro, Julie E. Maguire, Justin Hong, Matthew Cunningham, Han Jo Kim, Todd J. Albert, Abdullah M. Ali, Jean-Pierre Saint-Jeannet, Filomena Ristoratore, Chitra L. Dahia, Anna Di Gregorio