Question: What is the NCBI Accession Number for the length of 5304bp/377aa?
Schema: create table table_16849531_2 (ncbi_accession_number__mrna_protein_ varchar, length__bp_aa_ varchar, PRIMARY KEY (ncbi_accession_number__mrna_protein_))
SQL: select ncbi_accession_number__mrna_protein_ from table_16849531_2 where length__bp_aa_ = "5304bp/377aa"