def add_molecular_activity(_activity_identifier)
      argument(
        term(
          function(
            identifier('molecularActivity')),
          argument(
            parameter(
              prefix(nil),
              value(
                identifier('kin'))))))
    end
def add_molecular_activity(_activity_identifier)
      argument(
        term(
          function(
            identifier('molecularActivity')),
          argument(
            parameter(
              prefix(nil),
              value(
                identifier('kin'))))))
    end
Called by {#on_term} to create a +molecularActivity+ argument using the
 AST Sexpressions.