Although (B)Chl molecules in an inner pair are structurally very similar, they often have very different properties. The nearby protein environment could break the symmetry in the electronic structure of the pair, thus considerably changing its behavior during the electron donation. In case of a small asymmetry, this dimer could participate in electron-transfer processes as a supermolecule, whereas a strong asymmetry causes it to act as a pair of independent and weakly-coupled subunits. The degree of the electronic-structure asymmetry in inner pairs and corresponding radical cations, formed during the primary electron donation (for PSI and the BRC) or subsequent charge separation reactions (for PSII), is a frequently discussed issue in the field and received vast attention in the literature (for example, see Refs. ). In order to assess the asymmetry of the electronic ground state, chemical shifts of (B)Chl a molecules are often considered , whereas spin-density distributions are used for cation radical states of inner pairs . Solid-state Photochemically Induced Dynamic Nuclear Polarization Nuclear Magnetic Resonance (photo-CIDNP NMR) gives an access to both molecular properties. This methodology can be used to reconstruct spin-density maps of radical pairs inside RCs of plants and bacteria and can be applied to whole living cells or even entire intact plants .