Write SQL query to solve given problem: How many authors drafted the paper "Subcellular localization of nuclease in barley aleurone"?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(DISTINCT T2.Name) FROM Paper AS T1 INNER JOIN PaperAuthor AS T2 ON T1.Id = T2.PaperId WHERE T1.Title = 'Subcellular localization of nuclease in barley aleurone'