r, then C and D are separated by RS2, and one of the two ends of the linear molecule is JE2, which is adjacent to D.The goal is to transfer a portion of the Delivering Molecule, e.g. Segment A, into Receiving Molecule, replacing a segment on the Receiving Molecule (e.g. Segment C), thereby creating a ???Product Molecule??? that comprises A and D. For example, A may be a gene or partial gene of any