Ribosomal DNA references sequences I'm having a bit of trouble with searching for this piece of information. I'm doing a study related to phylogenetic susceptibility of hosts to pathogens (based on a recent Nature publication), specifically to flu. This requires knowing the **reference** 18S ribosomal DNA sequence for chickens, wild ducks, horses, pigs and humans (amongst others). Is there a resource that enables us to easily download these?

For birds you can start by searching _18s_ in <

But generally NCBI Nucleotide database, should provide you with all information and accession numbers. See this broad search: <

Adding species specification and other parameters, you might find what you are looking for. For example, see chicken 18S ribosomal RNA gene