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_127511_1 ( pacbio VARCHAR )

### Question ###
What is 454 gs flx when pacbio is 100-500 mb?

### Accurate SQL ###

SELECT 454 AS _gs_flx FROM table_127511_1 WHERE pacbio = "100-500 Mb"