Development of a dual-nanobody sandwich immunochromatographic strip based on a site-directed conjugation strategy for ultrasensitive detection of staphylococcal enterotoxin B (SEB) - Hao Zheng; Tingting Gong; Kaiyuan Chen; Wenjia Niu; Yulin Mao; Jian Hou; Zhilong Lu; Chen Luo; Tieqiang Sun; Zhiqiang Shen (Analytica Chimica Acta, 2026)