References

http://www.mayoclinic.com/health/phenylketonuria/DS00514/DSECTION=complications
http://www.mayoclinic.com/health/phenylketonuria/DS00514/DSECTION=risk-factors
http://www.mayoclinic.com/health/phenylketonuria/DS00514/DSECTION=causes
http://www.mayoclinic.com/health/phenylketonuria/DS00514/DSECTION=treatments-and-drugs
http://ghr.nlm.nih.gov/condition/phenylketonuria
http://www.mayoclinic.com/health/phenylketonuria/DS00514/DSECTION=symptoms
http://www.uic.edu/classes/phar/phar332/Clinical_Cases/aa%20metab%20cases/PKU%20Cases/PKU%20biochem%20intro.htm

Images:
http://www.babysfirsttest.org/sites/default/files/styles/large/public/photo3.jpg?itok=_1JhIoSx
http://4.bp.blogspot.com/-u_-EuuDi3hM/ULjeYd5_VtI/AAAAAAAAAIY/O9KQ-0WlPkI/s1600/PKU.gif
http://learn.genetics.utah.edu/content/disorders/whataregd/pku/images/pkuChrom.jpg
http://openwetware.org/images/d/dd/Pkudiet.jpg
https://www.google.com.sg/search?q=pku+affected+chromosomes&client=firefox-a&hs=Osh&rls=org.mozilla:en-US:official&source=lnms&tbm=isch&sa=X&ei=yELWUpGmJ4OVrAfli4GgBQ&ved=0CAkQ_AUoAQ&biw=1366&bih=639&dpr=1#facrc=_&imgdii=_&imgrc=HbBGfYnaSO-b-M%253A%3BYdfi7V0KCvLVwM%3Bhttp%253A%252F%252Flearn.genetics.utah.edu%252Fcontent%252Fdisorders%252Fsinglegene%252Fpku%252Fimages%252FpkuChrom.jpg%3Bhttp%253A%252F%252Flearn.genetics.utah.edu%252Fcontent%252Fdisorders%252Fsinglegene%252Fpku%252F%3B120%3B219