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. Author manuscript; available in PMC: 2007 Mar 29.
Published in final edited form as: Biochemistry. 2004 Jun 22;43(24):7653–7662. doi: 10.1021/bi049380h

Figure 7.

Figure 7

Gradients in the tip-to-base histidine and zinc distribution of a Nereis jaw (from ref 45). The left panel shows a sketch of a Nereis jaw sectioned for amino acid analysis (top) and the decrease of histidine content (bottom) from ~22 mol % at the tip to 5 mol % at the base and lateral to serrated side of the Nereis jaw. The right panel shows the Zn-fluorescence mapping with synchrotron radiation. Images from left to right display a light microscopic image of intact Nereis jaw, an X-ray absorption image (the dark region at the tip denotes greater absorption), and an X-ray fluorescence image (lighter colors indicate greater amount of Zn).