 We also consider receptor cluster formation on individual peroxisomes with enhanced levels of ubiquitinand find that size-selectivity, but not cluster formation , is suppressed.
<clarity>  We also consider receptor cluster formation on individual peroxisomes with enhanced levels of ubiquitinand find that size-selectivity, but not cluster formation , is suppressed.
 Excess ubiquitin, resulting from URLanelles, suppresses size-selectivity but not cluster formation , is suppressed.