What does the fly in breaking bad represent?

Related questions

1. Why is purple Marie Breaking Bad?
2. Did Jesse escape?
3. Why does Walter White cut the crust off?
4. Is Hank Walt's brother?
5. How did Jane die Breaking Bad?
6. Does Jesse Pinkman get away?
7. How did Gus know about the ricin?
8. What is the significance of the eyeball in breaking bad?
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Tags

1. #embarks
2. #contamination
3. #common
4. #represents
5. #speculated
6. #insect
7. #destroy
8. #appeared
9. #white
10. #obsessive
11. #irrational
12. #quest
13. #guilt
14. #superlab
15. #control
16. #flies
17. #breaking
18. #walter
19. #obsession