There are two models of protein folding that are currently being confirmed: 1  The diffusion collision model, in which a nucleus is formed, then the secondary structure is formed, and finally these secondary structures are collided together and pack tightly together.
ATT Validity Dates. 1  Each ATT is valid for a period of time specified by the BON/RB (the average length of an ATT is 90 days). 2  Once the BON/RB has declared you eligible to test and you receive your ATT, you must test within the validity dates on the ATT.
Once the board of nursing declares you eligible to test and your ATT is issued, you must test within the validity dates of your ATT nursing (varies from 60 days to 365 days; however, the average is 90 days).These validity dates cannot be extended for any reason.he ATT contains your authorization number, candidate identification number and an expiration date. You need the ATT to: 1  Schedule an appointment to take the NCLEX examination. 2  Be admitted to the test center on the day of the examination appointment.