thyroid hormone: thyroxine (t4). chemical formula.

thyroxine line diagram font text drawing brand document presentation cartoon circle sketch map plan design screenshot logo pattern chemical formula hormone thyroid gland abstract amino acid tyrosine art atom atoms biochemistry biology chart compound chemistry composition concept education graphic hormones icon iodine isolated levothyroxine medical medicine molecular molecule organic physical science skeletal structural structure thyroglobulin tyrosine-based hormonethyroxine hormone: t4 formula