Structure of chicken MRPL23/L23MRP. (A) Nucleotide sequence and predicted amino acid sequence of chicken MRPL23/L23MRP cDNA (GenBank accession no. AB101640). Arrowheads indicate the positions of exon–intron boundaries. (B) Alignment of the predicted amino acid sequences of human (GenBank accession no. BC027710), mouse (GenBank accession no. U84902), and chicken MRPL23/L23MRP.