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Fig. 2 | Stem Cell Research & Therapy

Fig. 2

From: Bibliometric analysis of global scientific activity on umbilical cord mesenchymal stem cells: a swiftly expanding and shifting focus

Fig. 2

The mapping on keywords of UC-MCS. a The keywords were divided into two clusters: cluster 1, “treatments and effects”; and cluster 2, “characteristics”. In general, the smaller the distance between two terms, the larger the number of co-occurrences of the terms. The size of the circle represents the frequency of the keyword, with a larger circle indicating the keyword appears more frequently. b Based on the average time of appearance, keywords in blue presented earlier than those in yellow and red

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