<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE amino-acid SYSTEM "aminoacids.dtd">
<amino-acid>
   <name>Histidine</name>
   <abbreviation>his</abbreviation>
   <symbol>h</symbol>
   <molecular-formula>C6H9N3O2</molecular-formula>
   <molecular-weight>155.16</molecular-weight>
   <isoelectric-point>7.47</isoelectric-point>
   <CAS-registry-number>71-00-1</CAS-registry-number>
</amino-acid>
