Focus on Tabernacle of the Linaioli and explain the Description.
The tabernacle is composed of a rectangular marble frame, with a triangular top with a sculpted almond depicting the "Blessing Christ and Cherubim". In the center, within an arched opening, are Fra Angelico's panel of the Maestà with twelve musician angels. 
At the front are two shutter panels with further paintings of saints. These are, internally, John the Baptist (left) and John the Evangelist (right); and externally Mark the Evangelist (left) and Saint Peter (right). The panels are completed by a  predella, placed below, with three scenes of St. Peter Dictating the Gospel to St. Mark, Adoration of the Magi and Martyrdom of St. Mark. The figure of Mark is recurrent due to his status as the patron of the corporation which commissioned the work.
The central panel, although damaged, has a style similar to Angelico's early works, with a marble step over which is the throne. Behind two draperies (perhaps a hint to the guild's textile activities) is a ceiling painted in blue with stars and the Holy Spirit dove, which is similar to Masolino's Annunciation in Washington, DC.
Mark the Evangelist Annunciation Washington, DC Maestà John the Baptist Masolino left Fra Angelico Saint Peter predella John the Evangelist