C9 and acute lymphoblastic leukemia: We initially examined C9orf72 transcript levels using a panel of qPCR assays designed to target all variants (C9-ALL), long forms (C9-LONG; NM_0.18325.3, NM_001256054.1), short form (C9-SHORT; NM_145005.5), and exon 1b-containing variant 1 (C9-EX1B; NM_0.18325.3).