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.
The CUSIP identifier may change for a security if its name or capital structure changes. No header or historical CUSIPs are reused on our files. 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