Unlike fermions, bosons not only can but prefer to occupy identical quantum states.
Although the predicted modifying genes are identical when present and the clusters occupy identical genetic regions, the core sequences are hypervariable.
None of the Zn2+ ions occupy identical sites in the two molecules, and about half are coordinated by only one or no protein residues, an indication of weak binding.
We presuppose that atoms do not leave the system, occupy identical volumes and only rearrange within some fixed crystalline sublattice.
To determine if the transcription factors PU.1 and Spi-B occupied identical regions within the mouse genome ChIP-seq was performed.
Most of the studies on the ETC are performed in Synechocystis (Savitsky et al., 2013) and assume that all of the factors involved occupy identical positions as shown in Thermosynechococcus or higher plants, this may lead to somewhat erroneous conclusions.
Many signaling pathways are often characterized as "conserved", not because individual protein sequences are constrained by natural selection, but because protein homologs occupy identical pathway positions across taxa and thus, presumably, perform similar functions.
The extent to which different members of transcription factor families bind to and occupy identical sites within the genome is a central issue, as different members of a given family activate distinct and cell-specific genetic programs [ 25].
While the templating idea is feasible, given that many histone modifiers are recruited by a partner effector protein that recognizes the modified product (reviewed in [ 23]), it would be technically very challenging to test whether the same histone molecule occupies the identical DNA sequence after DNA replication.
Notably, Sir3 R32 occupies an identical binding site to that observed for LANA R9 and RCC1 R223 in a cavity surrounded by H2A E61, D90, and D92.
