Before revision:  Many other exciting results, such as (i) there is a very strong salt bridge HIS187-ARG156 (N-O) linking alpha-helices 2 and 1 (if mutation H187R is made at position 187 then the hydrophobic core of PrPC will be exposed  , (ii)  there is a hydrogen bond Y169-D178  for BufPrPC instead of a polar contact Q168-D178 for bovine PrPC, (iii) BufPrPC owns 3-10 helices at 125-127, 152-156 and  the beta2-alpha2 loop respectively, etc, are also being found out .
After revision:  Many other exciting results, such as (i) there is a very strong salt bridge HIS187-ARG156 (N-O) linking alpha-helices 2 and 1 (if mutation H187R is made at position 187 then the hydrophobic core of PrPC will be exposed , (ii) there is a hydrogen bond Y169-D178 for BufPrPC instead of a polar contact Q168-D178 for bovine PrPC, (iii) BufPrPC owns 3-10 helices at 125-127, 152-156 and the beta2-alpha2 loop respectively, etc, has been discovered .