Input parameters:
(1) Temperature * °C 
(2) Ion concentrations *
a) Monovalent ion   M
b) Divalent ion [Mg2+]  M
(3) RNA structure *
(up to 1MB, in pdb format, should contain only 1 model)
(4) Job name *
(alphanumeric characters only)
(5) Email address (optional)
(If provided, the results will also be delivered via email)
References for MCTBI:
[1] Sun, LZ, Zhang, JX, Chen, SJ. (2017) MCTBI: a web server for predicting metal ion effects in RNA structures. RNA. 23: 1155-1165.
[2] Sun, L.-Z., Chen, S.-J.  (2016) Monte Carlo Tightly Bound Ion Model: Predicting Ion-Binding Properties of RNA with Ion Correlations and Fluctuations. J. Chem. Theory. Comput., 12, 3370-81.
[3] He, Z. J., Chen, S.-J.  (2012) Predicting Ion-Nucleic Acid Interactions by Energy Landscape-Guided Sampling. J. Chem. Theory. Comput., 8, 2095-2102.
[4] Tan, Z. J., Chen, S.-J.  (2005) Electrostatic correlations and fluctuations for ion binding to a finite length polyelectrolyte. J. Chem. Phys., 122, 44903.