Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_16849531_2 ( ncbi_accession_number__mrna_protein_ VARCHAR, species VARCHAR )

### Question ###
What is the NCBI Accession Number of the Homo Sapiens species?

### Accurate SQL ###

SELECT ncbi_accession_number__mrna_protein_ FROM table_16849531_2 WHERE species = "Homo sapiens"