Xuezhi Ouyang

A proteinase inhibitor II of Solanum americanum is expressed in phloem

Zeng-Fu Xu, M. Chye, E. Yeung, 2001, Plant Molecular Biology.

Chloroplast-Like Organelles Were Found in Enucleate Sieve Elements of Transgenic Plants Overexpressing a Proteinase Inhibitor

Junfeng Xie, Bao-jian Li, Zeng-Fu Xu, 2007, Bioscience, biotechnology, and biochemistry.