... This commit immediately obsoletes classmethods `Monomer.from_code*`, `Monomer.from_name` and `Sequence.from_monomers`. ... To allow pickling added `__getstate__` to `Monomer` to return all attributes, except `sequence` and `__setstate__` to `Sequence`, which runs through all monomers and returns the `sequence` attribute back to where it belongs. ... 36 def _subclass ( cls , name = '' , code1 = '' , code3 = '' , is_modified = False ): . ... 73 def __repr__ ( self ): . ... 76 def __str__ ( self ): . ...