There are multiple definitions:

1. thullium/thulium(English)

   • atomic number 69. It is the thirteenth element in the lanthanide series of metals
   • Tm-F
   • https://periodi…ment/69/thulium

2. melting temperature [of DNA](English)

   • heat causes the disordering of double helical structure of dsDNA, causing the breaking of double and triple bonds between two nucleotides in the complementary strands of DNA. The temperature at which this occurs is called as helix-to-coil transition temperature or melting temperature of DNA
   • DNA, dsDNA
   • Biophysics, Molecular biology
   • https://doi.org…-4939-9861-6_24

3. tropomyosin(English)

   • BP, Ca2+, CaM, CPI-17, DHF, DD, DHPR, ECG, ELC, FHC, HF, K+, MLCK, MLCP, Na/K, NCX, PLN, RLC, RyR2, SERCA2, SHF, SR, TD, TnC, TnI, TnT, Tm, T-tubule
   • Myocyte / muscle, Biomarker
   • https://doi.org…741-023-10352-z