Useful links describing Biology concepts

• Difference among chromosome, chromatin, and chromatid: link
• Reciprocal cross: wiki
• True breeding organism: wiki
• Genome imprinting: wiki, geneimprint
• Decoy sequence: biostars

Useful links for an iMac user

• Shortcuts in Mac OS X: link
• Shortcuts in Safari: link
• Close terminal on 'exit' command: cnet

Human Transcription Factor Databases

I was searching for all human transcription factors (TFs). I found the following databases.

1. TRANSFAC (link): It seems to be the most comprehensive database for eukaryotic TFs. It has both public and professional versions. As expected, the professional version contains more data. The first paper on TRANSFAC published in 2000 received more than 1000 citations so far.
2. DBD (link): It contains predicted transcription factors from whole genomes. The first paper on DBD published in 2008 received ~140 citations so far.
3. AnimalTFDB (link): As the name suggests, it contains animal transcription factors. The first paper on AnimalTFDB published in 2012 received ~25 citations so far.

The following discussions were helpful to know about these databases:

1. List Of All Transcription Factors In Human in Biostars (link)
2. Human transcription factors in ResearchGate (link)
3. Available Transcription Factor Databases (link)