Anomalous amide I infrared absorption of purple membrane

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Science  20 Apr 1979:
Vol. 204, Issue 4390, pp. 311-312
DOI: 10.1126/science.432645


Infrared absorption of purple membrane reveals an amide I frequency that falls outside the range normally found for alpha helices. This may indicate along with x-ray diffraction the existence of bacteriorhodopsin alpha helices with unusual structure.