To evaluate this possibility, we collected RNA-seq data from bone marrow of healthy Kdm6a F1s (n = 3), Kdm6a F1s with abnormal histiocytic proliferation or sarcoma (n = 2), and healthy control F1s (n = 5), and looked for transcriptional signatures consistent with altered regulation by ELK1, ELK4, or GABPA. Here, ELK4 is linked to sarcoma.