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Retroviral Gag organization domains. All retroviruses display matrix domain (MA, in violet), capsid (CA, in green), and nucleocapsid (NC, in orange). Spacer peptides (SP) and peptide sequences containing L domains are indicated within structural precursors of HIV-1, EIAV, FIV, HIV-2, RSV, MMTV, M-PMV, MLV, PERV, HTLV-I, HML-2, and PFV.
