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Figure 4: (a) Cell block showing tumor cells with positive immunostaining for p63. (b) Cell block showing tumor cells with positive immunostaining for cytokeratin 5/6. (c) Cell block showing tumor cells with negative immunostaining for thyroid transcription factor-1. (d) Cell block showing tumor cells with negative immunostaining for thyroglobuin

Figure 4: (a) Cell block showing tumor cells with positive immunostaining for p63. (b) Cell block showing tumor cells with positive immunostaining for cytokeratin 5/6. (c) Cell block showing tumor cells with negative immunostaining for thyroid transcription factor-1. (d) Cell block showing tumor cells with negative immunostaining for thyroglobuin