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.
It can take anywhere from 2 days to 2 months for your interview to schedule. It is normal .If you look at other people's timelines,you'll see. You can check approximate time frames for your DO at trackitt.com.t has been 10 days since my status changed to in line for interview scheduling. Maybe it is really so early to worry about, but I called USCIS Customer Service today (tel.