Unfortunately, I don't have any information about that either. But maybe someone might be interested. I'm currently trying to cross a selection of F2 generation of HRS 899 (Poncirus x Changsga) which has proven itself to withstand frost down to -20°C for many years, to hybridisize ist with a Moro Blood Orange. The fruit set looks good; let's see how it develops and whether it contains good seeds.