 This behaviour is consistent with a previous mathematical model that predicts that the speed of viral progression in URLanism has a maximum and then declines with the receptor level.
<clarity>  This behaviour is consistent with a previous mathematical model that predicts that the speed of viral progression in URLanism has a maximum and then declines with the receptor level.
 This behaviour is consistent with a previous mathematical model predicts that the speed of viral progression in URLanism has a maximum and then declines with the receptor level.