Chlorophyll is a tetrapyrrole pigment with a magnesium (Mg²⁺) ion at its center. The Mg ion is crucial for light absorption during photosynthesis. Other metals like Mo (molybdenum) or Mn (manganese) are involved in different plant processes but not in chlorophyll structure.
During synthesis, the spectral properties of chlorophyll are attained with the insertion of ______?
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