Complex sentence: Initial investigation of CB 2 receptor expression patterns focused on the presence of CB 2 receptors in the peripheral tissues of the immune system and found CB 2 receptor mRNA was found throughout tissues of the spleen, tonsils and thymus gland.
Split into simpler sentences: Initial investigation of CB 2 receptor expression patterns focused on the presence of CB 2 receptors in the peripheral tissues of the immune system. For instance, CB 2 receptor mRNA was found throughout the immune tissues of the spleen, tonsils and thymus gland.