Schematic depiction of the 3 PSGL-1 polymorphic variants.

Each decameric repeat is depicted as an oval. The largest variant (A) has 16 repeats, the B variant has 15 repeats (repeat 2 of the A form is missing), and the C variant has 14 repeats (repeats 9 and 10 of the A form are missing). Repeats of the A variant missing in the smaller variants are shaded gray; their sequences are given below the A variant.