“…Integrative analyses of such large-scale datasets originating from various samples, different platforms and different institutions globally, offer unprecedented opportunities to establish a comprehensive picture of cell landscape. To this end, various community generated large-scale atlas-level single cell reference data, such as the Human Cell Atlas (HCA) (Regev et al, 2017), Human Tumor Atlas Network (Rozenblatt-Rosen et al, 2020), BRAIN Initiative Cell Census Network (Winnubst and Arber, 2021) , Human Lung Atlas (Travaglini et al, 2020), Human Gut Atlas (Elmentaite et al, 2020), Hu-man BioMolecular Atlas Program (HuBMAP) (Snyder et al, 2019), The Tabula Sapiens (Jones et al, 2022), hECA (Chen et al, 2022a) etc., and recently great achievements has been made in the building of pan-tissue single-cell transcriptome atlases covering more than a million cells, including 500 cell types, across more than 30 human tissues from 68 donors (Domínguez Conde et al, 2022;Eraslan et al, 2022;Jones et al, 2022;Liu and Zhang, 2022;Suo et al, 2022). These references data facilitate the automatically cell type annotations in a supervised way without prior marker gene annotations (Aran et al, 2019;Duan et al, 2020;Kiselev et al, 2018;Liu et al, 2020;Ma and Pellegrini, 2020;Stuart et al, 2019).…”