McLaren Papers digitisation project, 2011. 7/9/12 Early version of a chapter published in Free Radicals, Australian Scholarly Publishing, 2003. The published chapter is very   different to this research article but it would be wise to check with the publisher. 14/6/12 Sent permissions request via email. 21/9/12 ASP confirmed author retains rights.  full-text made visible. lyn 14/10/2012