How many authors drafted the paper "Subcellular localization of nuclease in barley aleurone"?
'Subcellular localization of nuclease in barley aleurone' is the title of paper
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'