[1] Univ Aberdeen, Div Appl Med, Inst Med Sci, Aberdeen AB25 2ZD, Scotland
[2] Univ Glasgow, Inst Biodivers Anim Hlth & Comparat Med, Coll Med Vet & Life Sci, Glasgow G61 1QH, Lanark, Scotland
[3] Univ Nottingham, Sch Biosci, Loughborough LE12 5RD, Leics, England
[4] Univ Milan, Dipartimento Patol Anim Igiene & Sanita Pubbl Vet, Milan, Italy
[5] Univ Halle Wittenberg, Dept Anat & Cell Biol, Halle, Germany
[6] James Hutton Inst, Aberdeen AB15 8QH, Scotland