Fig. 3From: Characterization of covalent crosslinking strategies for synthesizing DNA-based bioconjugatesMALDI-TOF spectra of 12 bp ssDNA (a), the phosphoramidated conjugate on day 1 (b). The phosphoramidated conjugate after 7 days (c) and 14 days (d) upon storage at − 20 °C (n = 5)Back to article page