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Viable seed in Cara Cara orange - question of citrus genetics

My novice understanding of citrus genetics is that navel orange trees are self-sterile because they are essentially all clones within their own certain varieties, and their pollen can't fertilize their female flowers. I just found a fat seed inside a Cara Cara orange (delicious variety) and was able to coax it to germinate. Can I assume that the seed resulted from viable pollen from a different citrus cultivar, and that the resulting plant would be a hybrid between a Cara Cara navel and some as of now-unknown other citrus fruit tree?

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