Many proteins sequences contain motifs which display similarity. The s
imilarities between the repeats are a result of gene duplication and/o
r gene fusion. The evolutionary role of repeats within protein sequenc
es is considered and some repeat examples are given ranging from tande
m repeats to multiple types of repeats which are sequentially interspe
rsed. Existing computer methods to delineate repeats in individual pro
tein sequences are discussed and a novel sensitive repeat recognition
method is introduced.