MCM8 and keloid: Furthermore, cultured keloid keratinocytes were found to differentially express 538 genes in a study by Li and Wu (2016) and of these, further functional analysis identified homeobox A7 (HOXA7), minichromosome maintenance 8 (MCM8), proteasome subunit α type 4 (PSMA4) and proteasome subunit β type 2 (PSMB2) as key differentially expressed genes.