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Originally posted by LabRat:
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In Voice from the Past, Klein says the results of his initial tests on Superman's possible fertility looked promising - which would indicate very human-like DNA
Although the events of The Family Hour would overtake those of VftP and would seem to suggest that Klein's optimism on that score was premature.

LabRat smile
But Klein's earlier pessimism (in CotOC) may also have been premature. There he was going on about how 'obviously' Superman's DNA was more complex than a human's.

So I would say the field is completely open as so exactly how 'human' Clark is. His blood is red.

Big Apricot Superman Movieverse
The World of Lois & Clark
Richard White to Lois Lane: Lois, Superman is afraid of you. What chance has Clark Kent got? - After the Storm