Assertion: testis's germ cell | /r/HasProperty | antigen
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Source sentences:
text: Twelve-week gonads contained DDX4-positive germ cells, approximately half of which co-expressed OCT4, BLIMP1, AP2γ, key transcription factors for primordial germ cells (PGCs), and Ki-67, an antigen for proliferating cells (Supplementary Information, Fig.