Gene therapy: Perspective Series (‘Arena’), London Television Service production, available from CFL Vision, P.O. Box 35, Wetherby, LS23 7EX, UK. Fax: (44) 1937-5410-83, VHS only, in English, Arabic, French, Latin-American, Spanish versions, approx. 30 min, £29.36 (+ VAT in UK), overseas £90 or £105 for VHS/NTSC: SECAM on request