docs: def rotate_monomers(self, angle, radians=False):
          """ Rotates each Residue in the Polypeptide.
  
          Notes
          -----
          Each monomer is rotated about the axis formed between its
          corresponding primitive `PseudoAtom` and that of the 
          subsequent `Monomer`.
  
          Parameters
          ----------
          angle : float
              Angle by which to rotate each monomer.
          radians : bool
              Indicates whether angle is in radians or degrees.
          """
          if radians:
              angle = numpy.rad2deg(angle)
          for i in range(len(self.primitive) - 1):
              axis = self.primitive[i + 1]['CA'] - self.primitive[i]['CA']
              point = self.primitive[i]['CA']._vector
              self[i].rotate(angle=angle, axis=axis, point=point)
          return