Journal Article 2018 Nature CommunicationsHigh-throughput three-dimensional chemotactic assays reveal steepness-dependent complexity in neuronal sensation to molecular gradientsZhen Xu†, Peilin Fang, Bingzhe Xu, Yufeng Lu, Jinghui Xiong, Feng GAO, Xin Wang, Jun Fan, Peng Shi* PMID DOI