1.17.4.2 cytoplasm in response to DNA replication, subunit M2B redistributes from the cytoplasm to the nucleus 1.17.4.2 cytoplasm the subcellular localization of RNR2 is primarily nuclear in meristematic regions, and cytoplasmic in adult cells. RNR2 is constitutively nuclear in csn7 mutant seedlings 1.17.4.2 nucleus in response to DNA replication, subunit M2B redistributes from the cytoplasm to the nucleus 1.17.4.2 nucleus the subcellular localization of RNR2 is primarily nuclear in meristematic regions, and cytoplasmic in adult cells. RNR2 is constitutively nuclear in csn7 mutant seedlings