Vast public lands that climb from a ribbon of river-bottom are home to one of the largest populations of mule deer in the country, attracting the attention of hunters from across the West every October. Over 17,000 mule deer inhabit the hills and ranges of the Methow Valley.
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A co-receptor is a cell surface receptor that binds a signalling molecule in addition to a primary receptor in order to facilitate ligand recognition and initiate biological processes, such as entry of a pathogen into a host cell.erhaps the most famous and well-studied of the CCR family is CCR5 (and its near-homologue CXCR4) which acts as the primary co-receptor for HIV viral infection. The HIV envelope glycoprotein GP120 binds to CD4 as its primary receptor, CCR5 then forms a complex with CD4 and HIV, allowing viral entry into the cell.