Couldn't generate code for the following reason:
Encountered unsupported operator partialdiff; 
  In MathML apply element.
  In MathML math element.
  In CellMLComponent element with cmeta:id TCa with name TCa.
  In Model element with cmeta:id sachse_glanzel_seemann_2003_version01 with name sachse_glanzel_seemann_2003_version01.