how could he explain to hammond about the reality of dna dropouts , the patches , the gaps in the sequence that wu had been obliged to fill in , making the best guesses he could , but still , making guesses , the dna of the dinosaurs was like old photographs that had been retouched , basically the same as the original but in some places repaired and clarified , and as a result- as he spoke , hammond steered him toward the door .