Transfused platelets (plts) are either pooled random-donor platelet (plt) concentrates or single-donor apheresis plts. When stored for 5 days, all of these products are equally efficacious.
There are three parts to a CUSIP Number. Example: 912828 + NB + 2 would be 912828NB2 CUSIP 1  #. The First 6 digits (912828) identify the issuer. 2  In this case, the issuer is the Treasury Department. 3  The next two characters (NB) identifies the specific bond. 4  The last digit (2) has no significance in identifying the bond.
For securities no longer in existence or that were never assigned an official CUSIP identifier, CRSP has assigned a dummy CUSIP. identifier for use in this field in accordance with the rules published in the CUSIP Directory. There are two potential dummy CUSIPs which are assigned by CRSP. One, ***99*9*, (containing a 9 in the 4th, 5th and 7th character. positions) represents a CRSP assigned CUSIP with a dummy issuer number (the first 6 character positions) and a dummy issue. number (the last 2 character positions).