I've extracted key phrases related to your input text about 'skin trajectory analysis' and its applications in various fields. Here are the results:

Biological Applications:

1. Skin aging analysis

2. Single-cell transcriptome analysis of full-thickness skin after wounding

3. Gene Ontology (GO) analysis, Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis, and gene set enrichment analysis (GSEA)

4. B-cell developmental trajectory

Medical Applications:

1. Gunshot wound ballistics analysis

2. Skin regeneration research using a male rat scalp expansion model

Computational Methods:

1. Principal Component Analysis (PCA) in scRNA-seq tools like Seurat, SCANPY, and Cell Ranger R Kit

2. Trajectory optimization for hypersonic boost glide flight vehicle mission constraints

3. Skin color model estimation by trajectory analysis

Research Articles:

1. 'Analysis of Multi-Part Phenotypic Changes in Skin to Characterize the Trajectory of Skin Aging in Chinese Women'

2. 'Single-cell transcriptome analysis of full-thickness skin after wounding and scaffold placement'

Academic Resources:

1. PubMed Central (PMC) Journal List

2. Clin Cosmet Investig Dermatol

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Skin trajectory analysis