Rendering of the source text

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        <units name="per_s" units_ref="per_s"/>
        <units name="mM_per_s" units_ref="mM_per_s"/>
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        <variable initial_value="1.0e-3" name="H_int" public_interface="out" units="mM"/>
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        </math>
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        <variable name="J_NHE3_H" public_interface="in" units="mM_per_s"/>
        <variable name="J_NHE3_NH4" public_interface="in" units="mM_per_s"/>
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                        <divide/>
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                        <ci>J_NHE3_Na_Max</ci>
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                </apply>
            </apply>
        </math>
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        <map_variables variable_1="Na_int" variable_2="Na_int"/>
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        <map_variables variable_1="H_int" variable_2="H_int"/>
        <map_variables variable_1="NH4_ext" variable_2="NH4_ext"/>
        <map_variables variable_1="NH4_int" variable_2="NH4_int"/>
    </connection>
    <connection>
        <map_components component_1="fluxes" component_2="NHE3"/>
        <map_variables variable_1="J_NHE3_Na" variable_2="J_NHE3_Na"/>
        <map_variables variable_1="J_NHE3_H" variable_2="J_NHE3_H"/>
        <map_variables variable_1="J_NHE3_NH4" variable_2="J_NHE3_NH4"/>
        <map_variables variable_1="J_NHE3_Na_Max" variable_2="J_NHE3_Na_Max"/>
    </connection>
    <connection>
        <map_components component_1="fluxes" component_2="concentrations"/>
        <map_variables variable_1="Na_ext" variable_2="Na_ext"/>
    </connection>
    <connection>
        <map_components component_1="concentrations" component_2="environment"/>
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                            <rdf:li xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">Na/H antiporter</rdf:li>
                            <rdf:li xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">ion transport</rdf:li>
                            <rdf:li xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">kidney</rdf:li>
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                                        <vCard:Family xmlns:vCard="http://www.w3.org/2001/vcard-rdf/3.0#">Weinstein</vCard:Family>
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                    <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/">&#xd;
           A kinetically defined Na+/H+ antiporter within a mathematical model of the rat proximal tubule&#xd;
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                        <dc:title xmlns:dc="http://purl.org/dc/elements/1.1/">The Journal of General Physiology</dc:title>
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                    <bqs:volume xmlns:bqs="http://www.cellml.org/bqs/1.0#">105</bqs:volume>
                    <bqs:first_page xmlns:bqs="http://www.cellml.org/bqs/1.0#">617</bqs:first_page>
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