A 13-nucleotide long DNA template was sequenced by the chain-terminator method (the Sanger method) using a 5'-TAG primer. The resulting fragments were analyzed by gel electrophoresis as shown below. In each of the four different gel lanes (or wells), a different ddNTP was used (i.e. ddATP for the 1st well, ddGTP for the 2nd, ddCTP for the 3rd, and ddTTP or the 4th).
Determine the sequence of the DNA template strand.