Question: What is the NCBI Accession Number of the Homo Sapiens species?
Schema: create table table_16849531_2 (ncbi_accession_number__mrna_protein_ varchar, species varchar, PRIMARY KEY (ncbi_accession_number__mrna_protein_))
SQL: select ncbi_accession_number__mrna_protein_ from table_16849531_2 where species = "homo sapiens"