CREATE TABLE table_16849531_2 (ncbi_accession_number__mrna_protein_ VARCHAR(255), length__bp_aa_ VARCHAR(255))
What is the NCBI Accession Number for the length of 5304bp/377aa?
    
SQL: SELECT ncbi_accession_number__mrna_protein_ FROM table_16849531_2 WHERE length__bp_aa_ = "5304bp/377aa"