CREATE TABLE table_127511_1 (sequencer VARCHAR2, ion_torrent_pgm VARCHAR2)

What is the sequencer when ion torrent pgm is 200-400 bp?
SELECT sequencer FROM table_127511_1 WHERE ion_torrent_pgm = "200-400 bp"
SELECT "sequencer" FROM "table_127511_1" WHERE "200-400 bp" = "ion_torrent_pgm"