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Our objective was to compare the cell penetration and nuclear importation properties of 111 In-labeled and 123 I-labeled immunoconjugates (ICs) composed of 16-mer peptides (GRKKRRQRRRPPQGYG) derived from HIV-1 transactivator of transcription (tat) protein and anti-mouse IgG (mIgG) in BT-474 breast cancer (BC) cells.[ 111 In]tat ICs were constructed by site-specific conjugation...