Why are the 5’-ends of PCR Primer IIA and 3’ SMART-Seq CSD Prime IIA are blocked?

Why are the 5’-ends of PCR Primer IIA and 3’ SMART-Seq CSD Prime IIA are blocked?

 The 5’-ends of the PCR Primer IIA and 3’ SMART-Seq CSD Prime IIA, included in SMART-Seq mRNA Kit, are blocked to prevent ligation of sequencing adapters to DNA fragments carrying the SMART sequences, thus preventing the SMART sequences from entering the sequencing reads.

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