div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imagea href=https:reader039fdocumentsusreader039viewer20220204055750686e1a28ab0f07b02076html5page1jpg target=_blank img data-url=documentprotein-crystallography-fifty-years-of-pepsin-crystalshtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: Protein crystallography: Fifty years of pepsin crystals loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader039fdocumentsusreader039viewer20220204055750686e1a28ab0f07b02076html5thumbnails1jpg width=140 height=200 adivp© Nature Publishing Group1984pdiv