38 Another well-studied histone variant is H3.3, and in spite of the fact that it only differs in four amino acids from its canonical form H3, H3.3 has its distinct deposition pattern where it is preferentially enriched in transcriptionally active chromatin and regulatory sites.
It is preferentially expressed in lymphoid-derived and marrow-derived cells.
The fact that it is preferentially produced by the differentiated tumor types (carcinoids) points to a putative biological function in these tissues.
Carbon monoxide (CO) can extremely diminish the polymer electrolyte membrane fuel cell (PEMFC) performance since it is preferentially absorbed on the platinum catalyst layer blocking and reducing the number of catalyst sites available for the hydrogen oxidation reaction.
It is preferentially retained at the chondrocyte surface and involved in the organization of the pericellular matrix via interaction with cartilage proteoglycans (Smith et al., 1989).
Moreover, it has been suggested [33] that it is preferentially attached to the non-polar facets of the ZnO crystallite cutting off the access of zinc ions towards those facets, favoring the polar (001) face for growth.
It is preferentially found in the upper gastrointestinal tract (stomach 26%% and duodenum 28%%), followed by the small bowel (18 %), Meckel's diverticulum (6 %), the colon, spleen, and gallbladder [7, 8].
It is preferentially secreted by atrial myocytes under conditions of tachycardia [2], [4].
It is preferentially expressed on angiogenic blood vessels, mediating survival signal and facilitating vascular cell proliferation [20], [21].
In absence of insulin, GLUT4 is maintained sequestered in intracellular vesicles in tissues where it is preferentially expressed: adipose tissue, heart muscle and skeletal muscle [1], [2].
