The UMD-DYSF mutations database
Statistics: Sequence of exon 20 
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Potential stop codons from exon 20
| AA position |  Wild type codon |  Wild type AA |  exon |  Species | 
|---|
|  585 |  AAG |  Lys |  20 |  1 | 
|  586 |  TAC |  Tyr |  20 |  1 | 
| 587 | CTT | Leu | 20 | 1 | 
| 588 | AGG | Arg | 20 | 1 | 
| 589 | AGG | Arg | 20 | 1 | 
| 590 | CGC | Arg | 20 | 1 | 
|  591 |  AAG |  Lys |  20 |  1 | 
|  592 |  TAC |  Tyr |  20 |  1 | 
| 593 | TCC | Ser | 20 | 1 | 
| 594 | CTG | Leu | 20 | 1 | 
| 595 | TTT | Phe | 20 | 1 | 
| 596 | GCG | Ala | 20 | 1 | 
| 597 | GCC | Ala | 20 | 1 | 
| 598 | TTC | Phe | 20 | 1 | 
|  599 |  TAC |  Tyr |  20 |  1 | 
|  600 |  TCA |  Ser |  20 |  1 | 
| 601 | GCC | Ala | 20 | 1 | 
| 602 | ACC | Thr | 20 | 1 | 
| 603 | ATG | Met | 20 | 1 | 
| 604 | CTG | Leu | 20 | 1 | 
|  605 |  CAG |  Gln |  20 |  1 | 
| 606 | GAT | Asp | 20 | 1 | 
| 607 | GTG | Val | 20 | 1 | 
| 608 | GAT | Asp | 20 | 1 | 
| 609 | GAT | Asp | 20 | 1 | 
| 610 | GCC | Ala | 20 | 1 | 
| 611 | ATC | Ile | 20 | 1 | 
|  612 |  CAG |  Gln |  20 |  1 | 
| 613 | TTT | Phe | 20 | 1 | 
|  614 |  GAG |  Glu |  20 |  1 | 
| 615 | GTC | Val | 20 | 1 | 
| 616 | AGC | Ser | 20 | 1 | 
| 617 | ATC | Ile | 20 | 1 | 
| 618 | GGG | Gly | 20 | 1 | 
| 619 | AAC | Asn | 20 | 1 | 
|  620 |  TAC |  Tyr |  20 |  1 | 
| 621 | GGG | Gly | 20 | 1 | 
| 622 | AAC | Asn | 20 | 1 | 
|  623 |  AAG |  Lys |  20 |  1 | 
| 624 | TTC | Phe | 20 | 1 | 
| 625 | GAC | Asp | 20 | 1 | 
| 626 | ATG | Met | 20 | 1 | 
| 627 | ACC | Thr | 20 | 1 | 
|  628 |  TGC |  Cys |  20 |  1 | 
| 629 | CTG | Leu | 20 | 1 | 
| 630 | CCG | Pro | 20 | 1 | 
| 631 | CTG | Leu | 20 | 1 | 
| 632 | GCC | Ala | 20 | 1 | 
| 633 | TCC | Ser | 20 | 1 | 
| 634 | ACC | Thr | 20 | 1 | 
| 635 | ACT | Thr | 20 | 1 | 
|  636 |  CAG |  Gln |  20 |  1 | 
|  637 |  TAC |  Tyr |  20 |  1 | 
| 638 | AGC | Ser | 20 | 1 | 
| 639 | CGT | Arg | 20 | 1 | 
| 640 | GCA | Ala | 20 | 1 | 
| 641 | GTC | Val | 20 | 1 | 
| 642 | TTT | Phe | 20 | 1 | 
| 643 | GAC | Asp | 20 | 1 | 
| 644 | GGG | Gly | 20-21 | 1 | 
Red: Amino acids that can be mutated in a stop codon by a single substitution (example: GAT -> TAG)
Species: 1=Human; 2=Mammals; 3=Vertebrates