Simplified implementation of the BuildingBlock class.
Simplified implementation of the AssemblyLine class.
Simplified implementation of the Synthesis class.
Simplified implementation of the OpenReadingFrame class.
Simplified implementation of GeneCluster class.
Simplified implementation of Substrate class.
Simplified implementation of Peptide class.
Simplified implementation of Graph class.
Minor PEP8-related changes.
Simplified implementation of Vertex class.
Simplified implementation of DomainVertex class.
Simplified implementation of PeptideVertex class.