1. Editorial

   • Richard Robins
   • Richard Dixon
   • Carl Pinkert

   EditorialNotes Pages: 1 - 1

2. Guest comment

   • Frank H. Ruddle

   EditorialNotes Pages: 2 - 2

3. Targeting expression to the mammary gland: intronic sequences can enhance the efficiency of gene expression in transgenic mice

   • C. Bruce A. Whitelaw
   • Alan L. Archibald
   • A. John Clark

   Papers Pages: 3 - 13

4. Modification of phenotype in Belgian endive (Cichorium intybus) through genetic transformation byAgrobacterium rhizogenes: conversion from biennial to annual flowering

   • Li-Yan Sun
   • Gérard Touraud
   • David Tepfer

   Papers Pages: 14 - 22

5. An improved approach for transformation of plant cells by microinjection: molecular and genetic analysis

   • Martin Schnorf
   • Gabriele Neuhaus-Url
   • Gunther Neuhaus

   Papers Pages: 23 - 30

6. Coinjection strategy for visual identification of transgenic mice

   • Paul A. Overbeek
   • Estuardo Aguilar-Cordova
   • Michael W. Lieberman

   Papers Pages: 31 - 37

7. Transient and stable expression of marker genes in cotransformedPetunia protoplasts in relation to X-ray and UV-irradiation

   • Indridi Benediktsson
   • Ferdinand Köhler
   • Otto Schieder

   Papers Pages: 38 - 44

8. Humanbcr-abl gene has a lethal effect on embryogenesis

   • Nora Heisterkamp
   • Guido Jenster
   • John Groffen

   Papers Pages: 45 - 53

9. Phenotypic cost to plants of an extra gene

   • Vaughan A. Hilder
   • Angharad M. R. Gatehouse

   Papers Pages: 54 - 60

10. Forthcoming papers

    Announcement Pages: 61 - 61