And almost all humans have lost the caspase 12 gene from their genomes, probably because those who have it are more susceptible to bacterial infections.
大概是由于携带胱冬酶12基因的人更易受细菌感染的侵害，现在几乎所有人都已经失去了该基因。
2
Back then, the mitochondria didn't have stunted genomes as they do today, but normal bacterial chromosomes with several thousand genes.
Bacterial artificial chromosome (BAC) libraries are the most convenient, reliable and widely used genomic libraries in genome research of organisms with highly complex genomes.