Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the sequencer when ion torrent pgm is 200-400 bp?

### Inputs:
table_name: table, columns: ['Sequencer', 'Ion Torrent PGM', '454 GS FLX', 'HiSeq 2000', 'SOLiDv4', 'PacBio', 'Sanger 3730xl']

### Response:
SELECT Sequencer FROM table WHERE Ion Torrent PGM = 200-400 bp