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HSL null mice have a normal physical appearance and are nonobese, lacking an apparent phenotype, with the exception that homozygous males have severe oligo- or azospermia and are infertile [2]

The initial impression was hematologic malignancy, including but not limited to leukemia, lymphoma, or myelofibrosis given clinical findings such as B-symptoms like night sweats, neck lymphadenopathy, and subjective daily fever, along with pancytopenia

Follow-up testing: Keep checking B12 levels and adjust treatment as needed, every 3-6 months

Injections offer superior bioavailability, especially for *Vitamin B12*, which can be poorly absorbed orally in some individuals