The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
NOTE: this paid version of the app includes all the functionality from the FREE version and there is no iAds banner at the bottom of the screen.This is a great tool to learn amino acid structures and codes (single letter abbreviations). You will get different types of questions, so the learning process will not be boring. Examples of the questions are:- what is the structure of Alanine?- which structure corresponds to amino acid code A?- what is amino acid code for Alanine?... and so on!Statistics of your answers will be collected so you can see which amino acids you haven't learned good enough.