sentence: To rule out inhibition of class I PI3Ks as the driver of δ R Golgi retention , we used the class I isoform – specific PI3K inhibitors PI-103 ( PI3K C1 , α ) , IC87114 ( PI3K C1 , δ ) , and AS605240 ( PI3K C1 , γ ; Sadhu et al ., 2003 ; Camps et al ., 2005 ; Park et al ., 2008 ) .