Complex sentence: While it is unclear if this seryl residue homolog in other plant SPSes is phosphorylated to suppress SPS activity, conservation of the neighboring residues is observed in other plant species, and may potentially aid in recognition of a regulatory SPS-kinase.
Split into simpler sentences: While it is unclear if this seryl residue homolog in other plant SPSes is phosphorylated to suppress SPS activity, conservation of the neighboring residues has been observed in other plant species. This conserved sequence may potentially aid in recognition of a regulatory SPS-kinase.