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.
You will need to schedule an appointment within 30 days of being conditionally approved. The actual appointment date can be beyond the 30-day period. For example, the scheduled appointment date can be several months from now, as long as you schedule it within 30 days of the conditional approval date. Failing to schedule the interview within 30 days from the date of conditional approval will result in being denied.