(A) The critical strain and (B) the dynamic storage moduli (G′) of the hydrogels of 1T, 2T, 2C, 1A, 2A, 1G and 2G. (C) The CD spectra of the hydrogel 1T, the solution of deoxyadenosine (A10), the mixture solution of thymine acetic acid with deoxyadenosine (A10) in 1:1 molecular ratio, and the hydrogel of 1T mixed with deoxyadenosine (A10) in 1:1 molecular ratio; (D) the CD spectra of hydrogels of 2T, 2C, 2A, and 2G. The concentrations and pH values are same as in Figure 1.