BMC Genomics 2005, 6:136 http://www.biomedcentral.com/1471-2164/6/136 PFyigriumriedi3ne abundance in mitochondrial-encoded rRNA and codon positions in membrane and soluble protein transcripts Pyrimidine abundance in mitochondrial-encoded rRNA and codon positions in membrane and soluble protein transcripts. (A) Complete transcripts (B) Codon positions in membrane protein transcripts (C) Codon positions in soluble protein transcipts. Mitochondrial genes from Arabidopsis thaliana, Marchantia polymorpha, Chlamydomonas reinhardtii, Chondrus crispus, Porphyra purpurea, Saccharomyces cerevisiae, and Metridium senile were analyzed. Unknown ORFS and hypothetical genes were excluded. been shown previously for transcripts of nuclear-encoded proteins [10] and for the second codon position in mito- chondrial transcripts from animals and other metazoan mitochondrial genomes that strictly encode membrane proteins [11]. We show that the correlation holds nicely for entire mitochondrial protein transcripts, whether the Page 6 of 12 (page number not for citation purposes)