noting the scarcity of cpg dinucleotide in total genomic dna derived from higher organisms and the scarcity of tpa dinucleotide in total genomic dna derived from most life forms , we examined the distribution of these dinucleotides in sequences derived from functionally distinct types of human dna , including mitochondrial dna , intergenic dna , intron dna , and dna destined to be represented in the cytoplasm as mrna , trna , or rrna .
C0887856
intergenic dna
C0012854
dna