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7 godz. temu · Structure Connexon pairing across membranes bridges the gap between two cells and between vesicles to membranes. In vertebrates, gap junction hemichannels are primarily homo- or hetero-hexamers of connexin proteins.Hetero-hexamers at gap junction plaques, help form a uniform intercellular space of 2-4 nm. In this way hemichannels in the membrane of each cell are aligned with one another ...
7 godz. temu · Map showing frequency of R1a haplogroup in Europe. Haplogroup R1a, or haplogroup R-M420, is a human Y-chromosome DNA haplogroup which is distributed in a large region in Eurasia, extending from Scandinavia and Central Europe to Central Asia, southern Siberia and South Asia.. While one genetic study indicates that R1a originated 25,000 years ago, its subclade M417 (R1a1a1) diversified c. 5,800 ...
7 godz. temu · Representation of a DNA molecule that is methylated. The two white spheres represent methyl groups.They are bound to two cytosine nucleotide molecules that make up the DNA sequence.. DNA methylation is a biological process by which methyl groups are added to the DNA molecule. Methylation can change the activity of a DNA segment without changing the sequence.
