Saedler H, Kubai D F, Nomura M, Jaskunas S R
Mol Gen Genet. 1975 Nov 3;141(1):85-9. doi: 10.1007/BF00332381.
The insertion mutations I15 and I16 in the ribosomal protein gene cluster at 64 min in Escherichia coli are identified as IS1 and IS2 using electron microscope heteroduplex analysis.