\begin{document}$ c\bar{c}u\bar{s} $\end{document} in the framework of the QCD sum rules. The predicted tetraquark mass \begin{document}$ M_Z = 3.99\pm0.09\;\rm{GeV} $\end{document} is in excellent agreement with the experimental value \begin{document}$ 3985.2^{+2.1}_{-2.0}\pm1.7\;\rm{MeV} $\end{document} from the BESIII collaboration, which supports identifying \begin{document}$ Z_{cs}(3985) $\end{document} as the cousin of \begin{document}$ Z_c(3900) $\end{document} with quantum numbers \begin{document}$ J^{PC} = 1^{+-} $\end{document}. We take into account the light flavor \begin{document}$ SU(3) $\end{document} mass-breaking effect to estimate the mass spectrum of the diquark-antidiquark type hidden-charm tetraquark states with strangeness according to previous studies."> Analysis of <i>Z<sub>cs</sub></i>(3985) as the axialvector tetraquark state -
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