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4 Materials and methods 4.1 Cell culture and in vivo experiments 4.1.1 Cell lines Four human NB cell lines were used in this paper: Be(2)-C (MNA), IMR5-/75-shMYCN (29) (MNA, doxycycline-inducible shRNA targeting MYCN, resulting in MYCN downregulation), IMR-32 (MNA), and SH-SY5Y/6TR(EU)/pTrex-Dest-30/MYCN (non-MNA, doxycycline-inducible transgene, resulting in MYCN overexpression)

It's whether the research question justifies the added complexity

Silverstein said he decided to investigate the over-prescribing of B12 shots, because "as an internal medicine resident, I have seen many patients come into the emergency department, and they were getting B12 injections without having a really good reason for it." His study could not determine why family physicians were prescribing it inappropriately including whether it was initiated by the doctor or at the request of the patient

Since the installation of anti-doping rules and regulations and their international enforcement in the mid-1960s, mass spectrometry has been an integral part of doping control procedures