The structural characteristics of select mite Helentrons and their non-autonomous partners. The open black box denote the ORF encoding the Rep/Helicase protein (the lighter green is the Rep, the medium green is the helicase, and the endonuclease is the darker olive shade). The orange block denotes the ORF encoding the RPA protein. The green arrows represent the subterminal repeats (subTIRs). The red stem loop structure represents the 3' palindrome. The red T represents the flanking host sequence. Black vertical and horizontal lines point to the pairwise sequence identities and length of alignment (excluding gaps) of the sequences compared. (A) The structure of Helentron-Mo-1A. (B, C) The structures of two deletion derivatives of Helentron-Mo-1A (HINE-Mo-1A.1 and HINE-Mo-A.2). (D) Is the structure of a different subfamily of Helentrons (Helentron-Mo-1 K). (E-G) The structures of deletion derivatives related to the Helentron-Mo-1 K (HINE-Mo-1 K.1, HINE-Mo-1 K.2, and HINE-Mo-1 K.4).