Douglas O Clary & David R Wolstenholme: The Drosophila mitochrondial genome; Nicholas J Cowan: Tubulin genes and the diversity of microtubule function; Eric A Fyrberg: Structural and functional analyses of Drosophila Melanogaster actin genes; B Groner, B Salmons, W H G "unzberg, N E Hynes, & H Ponta: Expression of proviral DNA of mouse mammary tumour virus and its transcriptional control sequences; Alan Hall: The ras gene family; Paul A M Michels: Activation of genes for variant surface glycoproteins in trypanosomes; Cary Queen: Regulation of immunoglobulin transcription; J F Savouret, A Guiochon-Mantel, & E Milgrom: The uteroglobin gene, structure and interaction with the progesterone-receptor.