Plasmid pFD13 ( SmRSuRHg++RCmRTcR ) was found harboring in E. colt B7 isolated from Fudan University compus. Transposon Tn 2981 was found on the plasmid pFD13, and carries streptomycin, sulfadiazine, mercury chloride resistant genes.

• 在复旦大学校园分离到1株带有抗药性质粒pFD13(Sm~RSu~RCm~RTc~RHg~R)的大肠杆菌B7,并在pFD13上发现1个转座子,它带有链霉素(Sm~R)、汞盐(Hg~R)、磺胺嘧啶(Su~R)抗性基因,定名为Tn2981。