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proteins. It is typically a signal moiety that directs the protein to which it is attached towards cellular<br />

membranes [26].<br />

Page 494<br />

Above the β cylinder is an ion, thought to be Ca 2+, which lies right on the five-fold axis and coordinates<br />

to the five adjacent VP1 polypeptides [25,27]. The proximity of the β cylinder to structures shown later<br />

to become external during uncoating (portions of VP1, VP4) suggests that it may be important in<br />

uncoating.<br />

III. The Human Rhinovirus Life Cycle<br />

The HRVs must undergo a number of transitions to replicate (Figure 3). First, they must attach to the<br />

cell surface at a cellular receptor. They are then internalized into the cell via the endosomal<br />

compartment. Following internalization, they must eject their RNA out of the viral capsid, through a<br />

lipid bilayer, and into the cytosol in a manner that preserves the integrity of the RNA. Replication<br />

Figure 3<br />

A schematic diagram depicting some of the<br />

required steps in viral replication.<br />

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