brief introduction: Joint: equipment installed between cable and cable with certain insulation and sealing performance, so that two or more cables run continuously. In genetic engineering, a sequence in which two DNA molecules or the ends of a DNA molecule are conjugated by an enzyme and then covalently linked by a ligase. Synthetic hexamer joints (incisors containing a specific enzyme) are commonly used, or multiple hexamer joints can be linked together to form polylinker joints. Wire joint: also known as wire hea