The annotation of a molecular sequence.

It is recommended to annotate by using the optional ‘ref’ attribute.

:Parameters:

ref : string
    reference string, e.g. 'GO:0008270',
    'KEGG:Tetrachloroethene degradation', 'EC:1.1.1.1'
source : string
    plain-text source for this annotation
evidence : str
    describe evidence as free text (e.g. 'experimental')
desc : string
    free text description
confidence : Confidence
    state the type and value of support (type Confidence)
properties : list
    typed and referenced annotations from external resources
uri : Uri
    link