A cell that carries out the final response or function of a particular process. The main effector cells of the immune system, for example, are activated lymphocytes and phagocytesâthe cells involved in destroying pathogens and removing them from the body.
Best Answer: Yes you can track it online here: https://tools.usps.com/go/TrackConfirmAc... The tracking number should look like this: CP 000 000 000 US. You can find it on the receipt, and the customs form you filled out.
Enter your 20-digit certified mail tracking number here and we'll pull up a list of all the USPS letter tracking scans. We can track your letter even if you didn't use our online tools to create your certified letter; simply enter your number and click the track it button. If you didn't find the results you were looking for, you might want to try and re-enter the number and make sure that you enter all 20 digits.