text: import PyOpenWorm as P
  from PyOpenWorm import Cell
  
  class Muscle(Cell):
      """A single muscle cell.
  
      See what neurons innervate a muscle:
  
      Example::
  
          >>> mdr21 = P.Muscle('MDR21')
          >>> innervates_mdr21 = mdr21.innervatedBy()
          >>> len(innervates_mdr21)
          4
  
      Attributes
      ----------
      neurons : ObjectProperty
          Neurons synapsing with this muscle
      receptors : DatatypeProperty
          Get a list of receptors for this muscle if called with no arguments,
          or state that this muscle has the given receptor type if called with
          an argument
      """
  
      def __init__(self, name=False, **kwargs):
          Cell.__init__(self, name=name, **kwargs)
          self.innervatedBy = Muscle.ObjectProperty("neurons",owner=self,value_type=P.Neuron, multiple=True)
          Muscle.DatatypeProperty("receptors",owner=self,multiple=True)
  
      def __str__(self):
          return self.name()
  