The Protein HEXIM1 peptide has adapter on either side of the HEXIM arginine rich motif as matched to the HIV-1 Tat Subtype B from the following study: Pham, V.V., Salguero, C., Khan, S.N. et al. HIV-1 Tat interactions with cellular 7SK and viral TAR RNAs identifies dual structural mimicry. Nat Commun 9, 4266 (2018). https://doi.org/10.1038/s41467-018-06591-6.