preferred_name: SL (surrogate light chain) binds IgH to form pre-BCR (Mus musculus)
preferred_name_lc: sl (surrogate light chain) binds igh to form pre-bcr (mus musculus)
label: SL (surrogate light chain) binds IgH to form pre-BCR (Mus musculus)
label_lc: sl (surrogate light chain) binds igh to form pre-bcr (mus musculus)