- A system to study transcription by yeast RNA polymerase I within the chromosomal context: functional analysis of the ribosomal DNA enhancer and the RBP1/REB1 binding sites. Kulkens, T., van der Sande, C.A., Dekker, A.F., van Heerikhuizen, H., Planta, R.J. EMBO J. (1992)