That such residue was not present in rock layers laid down prior to 1945 made that starting point a very definitive marker.
But this year, web-shopping initiatives have dulled the impact of Black Friday as a definitive marker of purchasing behavior.
The disorder lacks a definitive marker for diagnosis this means there is potential for over-diagnosis.
I needed to be reminded that milk production was not the definitive marker of my ability to parent well.
There is currently no definitive marker of MHV-68 latency.
The co-localization (yellow) of VGlut2 and NCAM provided the first definitive marker of OB glomeruli in the human and revealed a level of complexity not anticipated.
In addition to permanent proliferation arrest, additional markers of senescence have been developed, although none of these is currently seen as being a definitive marker of the senescent state [39].
A major limitation that remains in the Treg biology field is the isolation of functional Treg subsets with a definitive marker as traditional Treg cell associated markers are also expressed transiently on non-regulatory activated T cells (e.g., GITR, CD25, CTLA-4, FoxP3) [1]–[3].
