fɚɹə pɹˈoʊtiːn ʌv lˈɛŋθ wɪð ɹˈoʊɾeɪmɚz pɜː ɹˈɛsɪdˌuː, ðɪ ˈɛnɚdʒi æt ðə kˈɜːɹənt ˌɪɾɚɹˈeɪʃən ɪz dᵻskɹˈaɪbd baɪ ðə fˈɑːloʊɪŋ ɛkspɹˈɛʃən.
For a protein of length  with  rotamers per residue, the energy at the current iteration is described by the following expression.