Heterochromatin genes can be expressed, but they are typically expressed at lower levels compared to genes located in euchromatin regions. Heterochromatin is a tightly packed form of chromatin that is associated with gene silencing, but some genes within heterochromatin regions can still be expressed under certain conditions. The level of gene expression in heterochromatin regions can be influenced by various factors, such as chromatin remodeling complexes and transcription factors.