TRPM7 and neuroblastoma: TRPM6 expression in SHEP-2 and SHEP-21N is not serendipitous, as data mining of Kocak-649 and other public neuroblastoma cohort expression profiles showed very similar expression levels and patterns: TRPM7 mRNA expression is ubiquitous and TRPM6 mRNA is much lower, and present in only ~10% of samples (results not shown).