Zinc fingers belong to the domain DZF (IPR006561). contains interleukin enhancer binding factor 3 (also known as nuclear factor of activated T cells 90 kDa, NF90, DRBP76 or NFAR). It interacts with highly structured RNA and dsRNA-activated protein kinase (PKR), as well as contains two double-stranded RNA binding motifs (dsRBM). Interleukin enhancer binding factor 2 (also known as NF45) appears to function predominantly as a heterodimeric complex with NF90. Spermatid perinuclear RNA binding protein (SPNR, also known as STRBP) is a testis-specific paralog of NF90.