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. 2020 Nov 10;11:574856. doi: 10.3389/fphys.2020.574856

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Copyright © 2020 Liu, Liu, Li, Chi, Wang, Wang, Ma, Han, Zhao, Guo and Xu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Heat map of the hierarchical clustering analysis of the top 50 differentially expressed metabolites in the comparison of NLQS with VQS in the honeybee Apis mellifera. (A) Differentially expressed metabolites were separated using hierarchical clustering. The x-axis has the eight (1–8) biological replicates of each type of spermatheca, and the y-axis represents the differentially expressed metabolites separated using hierarchical clustering. The color from green to red indicates an increase in abundance of metabolites from low to high, respectively. (B) VIP values of each differentially expressed metabolite.