Naturally occurring polymorphism; second exon of Nopp140 contains three tandem repeats of the P' pattern. The P' repeat starts at nucleotide 900 of the second exon and is 96bp in length. Each repeat encodes a 31 amino acid peptide sequence, functional codons start with the second nucleotide within the repeat, thus leaving 2 nucleotides at the end of the repeat.
Region in Nopp140 exon 2 that contains a variable number of tandem repeats in different strains. The sequenced strains contains the P' repeat pattern with three 96bp repeats extending from 3L:21834079..21834174 , 3L:21834175..21834270 , and 3L:21834271..21834366 .
