The structural clues presumably complement their use of ontological information.
We do not merely encounter clues as to what persons are thinking, mere signs or manifestations, but the persons themselves.
The allusions create clues enough, and we need not unpack them as we go.
If it does exist the gene may help resolve some of the questions about how antibiotics work and give clues for new antibiotics.
The connections of cortical areas may give some clues about homology.
An analysis of the origins of partnerships, their supporters and sponsors, gives some important clues in the diagnosis of the development of partnerships to date.
While comprehensive data will always be elusive, a myriad of partial and indirect clues now support these broad conclusions.
There may be a mix within that and there can be subtle visual clues that they are not all the same.