Editing Genome (section)

===Nuclear genome===
Eukaryotic genomes are even more difficult to define because almost all eukaryotic species contain nuclear chromosomes plus extra DNA molecules in the [[Mitochondrion|mitochondria]]. In addition, algae and plants have [[chloroplast]] DNA. Most textbooks make a distinction between the nuclear genome and the organelle (mitochondria and chloroplast) genomes so when they speak of, say, the human genome, they are only referring to the genetic material in the nucleus.<ref name = Graur /><ref>{{ cite book |vauthors = Brown, TA |date = 2018 |title = Genomes 4 |publisher = Garland Science |place = New York, NY, USA |isbn = 9780815345084}}</ref> This is the most common use of 'genome' in the scientific literature.