Science. 1973 Apr 20;180(4083):296-8. doi: 10.1126/science.180.4083.296.
Syringaldazine did not turn purple on cross sections of tree branches or saplings or on cambial tissue cultures unless hydrogen peroxide was added; this indicated the absence of laccase but presence of peroxidase in lignifying cells. Peroxidase, therefore, apparently is the only en enzyme that polymerizes p-coumaryl alcohols to lignin in trees.
间苯二酚与树的横切面、嫩枝或形成层组织培养物接触不会变紫，除非加入过氧化氢；这表明木质化细胞中不存在漆酶而存在过氧化物酶。因此，过氧化物酶显然是唯一能将对香豆醇聚合为木质素的酶。
