using a dna probe for the switch region of immunoglobulin heavy chain genes , together with the restriction endonuclease sst i , we detected a particular polymorphic dna pattern in 17 of 28 patients ( 60.7 % ) with psoriatic arthropathy but in only 5 of 41 patients ( 12.2 % ) with psoriasis alone .
C0000702
a dna
C0012854
dna