The following information accompanied a stock donated to the Bloomington Stock Center by Dave Casso, University of California at San Francisco.
P{Wee-P.ph0}2 is an insertion on CyO.  It expresses GFP strongly in middle and late stages of embryogenesis.
Bloomington will use the balancer short name CyO, P{Wee-P.ph0}2 for this balancer variant.