<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="" style="font-family: ArialMT;"><span class="" style="font-size: 14px;"></span></div><div class="" style="font-family: ArialMT;"><span class="" style="font-size: 14px;"><br class=""></span></div><div class="" style="font-family: ArialMT;"><span class="" style="font-size: 14px;"><br class=""></span></div><div class="" style="font-family: ArialMT;"><span class="" style="font-size: 14px;"></span></div><div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div>______________________________<br class=""><br class="">Dr. David Barford<br class=""><br class="">Structural Studies Division<br class="">MRC Laboratory of Molecular Biology<br class="">Francis Crick Avenue<br class="">Cambridge CB2 0QH, UK.<br class=""><br class="">e.mail: <a href="mailto:dbarford@mrc-lmb.cam.ac.uk" class="">dbarford@mrc-lmb.cam.ac.uk</a><br class=""><br class="">Tel. +44 (0)1223 267075<br class="">07919 927824 (M)</div></div>
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