T cells - 2025 ACF Regionals

Question

During skin infections, langerhans cells can take up antigens to present to these lymphocytes. For 10 points each:

[10e] Name this type of immune cell that comes in “cytotoxic” and “helper” varieties, and develops in the thymus.

ANSWER: T cells [accept cytotoxic T cells or helper T cells]

[10h] Langerhans cells travel to lymph nodes to interact with T cells described by this word, which have differentiated and undergone central selection, but have not been exposed to their corresponding antigen.

ANSWER: naive [accept naive T-cell or Th0]

[10m] Langerhans cells are thought to be a specialized type of these antigen-presenting cells that act as messengers between the innate and adaptive immune systems. These cells come in “conventional” and “plasmacytoid” types, and are named for resembling the branched projections of neurons.

ANSWER: dendritic cells [or DCs or veiled cells; accept conventional dendritic cells or plasmacytoid dendritic cells or cDCs or pDCs; accept myeloid dendritic cells or mDCs; reject “dendrites”]

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Summary


California	2025-02-01	Y	3	16.67	100%	67%	0%
Florida	2025-02-01	Y	3	13.33	67%	67%	0%
Lower Mid-Atlantic	2025-02-01	Y	6	20.00	100%	83%	17%
Midwest	2025-02-01	Y	6	18.33	100%	83%	0%
North	2025-02-01	Y	3	16.67	100%	33%	33%
Northeast	2025-02-01	Y	5	20.00	100%	60%	40%
Pacific Northwest	2025-02-01	Y	2	20.00	100%	50%	50%
South Central	2025-02-01	Y	2	20.00	100%	50%	50%
Southeast	2025-02-01	Y	4	15.00	75%	50%	25%
UK	2025-02-01	Y	10	17.00	90%	70%	10%
Upper Mid-Atlantic	2025-02-01	Y	8	18.75	100%	63%	25%
Upstate NY	2025-02-01	Y	2	15.00	100%	50%	0%

Data


UC Berkeley B	Claremont A	10	0	0	10
UCSD	UC Berkeley A	10	0	10	20
Florida State A	Valencia A	0	0	10	10
Florida B	UCF B	10	0	0	10
Florida A	UCF C	10	0	10	20
Duke	UNC C	10	0	10	20
Virginia Tech A	Liberty A	10	0	10	20
Liberty B	William & Mary	10	0	0	10
UNC B	South Carolina	10	10	10	30
Virginia A	Liberty C	10	0	10	20
Wake Forest	UNC D	10	0	10	20
Chicago C	Chicago B	10	0	10	20
Missouri	Chicago D	10	0	10	20
Illinois C	Indiana B	10	0	10	20
Indiana A	Illinois B	10	0	10	20
Missoui S&T	Illinois A	10	0	0	10
Chicago A	WashU B	10	0	10	20
Iowa State	Carleton	10	0	10	20
Winona State	Minnesota B	10	10	0	20
Wisconsin A	Wisconsin B	10	0	0	10
Tufts A	Brandeis A	10	0	0	10
Brandeis B	BU	10	0	10	20
Harvard A	Dartmouth A	10	0	0	10
MIT A	Harvard B	10	10	10	30
Brown A	UMass Boston	10	10	10	30
UCLA	Claremont B	10	0	10	20
Alberta	UBC	10	10	10	30
UW B	UW A	10	0	0	10
ASU	TAMU	10	10	10	30
Texas A	Texas B	10	0	0	10
Georgia Tech B	Louisville A	0	0	0	0
Georgia Tech C	Georgia Tech D	10	0	10	20
Georgia Tech A	Vanderbilt A	10	10	10	30
Bruin A	Tennessee A	10	0	0	10
Oxford C	Bristol	0	0	0	0
Cambridge A	NYU C	10	0	10	20
Oxford A	Cambridge B	10	0	10	20
Manchester	Cambridge C	10	0	10	20
Cambridge D	LSE	10	0	10	20
Cambridge E	Imperial A	10	10	10	30
Warwick A	Durham	10	0	0	10
Imperial B	Warwick B	10	0	10	20
Sheffield	Southampton A	10	0	0	10
Southampton B	Oxford B	10	0	10	20
Maryland A	Columbia B	10	0	10	20
Haverford A	Cornell B	10	0	0	10
George Washington A	Vassar A	10	0	10	20
George Washington B	Maryland B	10	0	0	10
John Jay College	Haverford B	10	10	10	30
Johns Hopkins A	NYU B	10	0	10	20
Penn A	Penn B	10	10	10	30
Yale A	Rutgers A	10	0	0	10
RIT A	Cornell D	10	0	10	20
RIT B	ESF A	10	0	0	10