DNA printing involves a base-by-base construction process, differing significantly from traditional ink printing.
Instead of printing all instances of one "ink" (nucleobase) at once, the DNA is built sequentially. According to the provided reference, the "inks" representing the four nucleobases (Adenine, Guanine, Cytosine, and Thymine) are selected and added one at a time to a solid phase, where each base binds to the preceding one, effectively extending the DNA strand.
In essence, the key difference lies in the sequential addition of nucleobases instead of printing complete sequences of each base in separate runs.
