PCI Products › PDL1 HIGH SINGLE CONTROL FFPE BLOCK Image 1 of 3 Image 2 of 3 Image 3 of 3 PDL1 HIGH SINGLE CONTROL FFPE BLOCK $500.00 Single paraffin wax.A single FFPE block is comprised of a single cell line plug selected for demonstrating PDL1 HIGH potein expression. Add To Cart Added! Single paraffin wax.A single FFPE block is comprised of a single cell line plug selected for demonstrating PDL1 HIGH potein expression.